In contrast to all prior studies on plant tropism, Went's experiment involved extracting a plant hormone through one plant & using it to alter the growth patterns of an entirely different species.
Ingrid Warmolt The 1928 experiment by Dutch researcher Went proved auxin's presence in plants. His focus gradually switched to the effects of the environment on plant growth. He was first researcher at Caltech to investigate the role of hormones on plant growth and development. Went was able to capable of stimulating growth in beheaded shoots by applying the auxin-containing agar to the cut ends of the shoots. Auxin molecules distributed into the agar. The experiment conducted by Went was the second time a hormone had been extracted from a plant.
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thinking about how we classify living organisms into domains, which pair of organisms is most closely related?
Organisms that are most closely related are typically those that share the most recent common ancestor. In terms of domains, the Archaea and Eukarya domains are believed to be more closely related to each other than either is to the Bacteria domain.
Therefore, the pair of organisms that are most closely related would be one from the Archaea domain and one from the Eukarya domain.
The three domains of life are Bacteria, Archaea, and Eukarya. The Archaea and Bacteria domains are both composed of prokaryotic organisms, while the Eukarya domain includes all eukaryotic organisms. Eukaryotes have a distinct nucleus and other membrane-bound organelles, while prokaryotes lack these structures.
According to molecular and genetic evidence, Archaea and Eukarya are more closely related to each other than either is to Bacteria. Archaea and Eukarya share several features that distinguish them from Bacteria, including similarities in DNA replication, transcription, and translation. They also share some membrane lipids and some similarities in their cell walls.
Therefore, if we were to choose one organism from each of these two domains, they would be expected to share more recent common ancestry than either would with a representative organism from the Bacteria domain.
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as the evolutionary biologist in charge of a student project to create a phylogenetic tree that better clarified the evolutionary relationships between the species listed in the accompanying figure, you asked the students to pose a question that would be a logical first step to better understand the evolutionary history of the group. which student question would be the best starting point?
b) Can we evaluate evidence to determine the relationships of species D, E, and F? evolutionary history of the group
Evolutionary history refers to the development and diversification of life on Earth over billions of years, as organisms have evolved and adapted to changing environments through natural selection and other processes. It encompasses the genetic, morphological, and behavioral changes that have occurred in different species and lineages over time, as well as the relationships and branching patterns between different groups of organisms. By studying the evolutionary history of different organisms, scientists can gain insight into the processes that have shaped life on Earth, including the role of major events like mass extinctions and the emergence of new evolutionary innovations.
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The full question was :
As the evolutionary biologist in charge of a student project to create a phylogenetic tree that better clarified the evolutionary relationships between the species listed in the accompanying figure, you asked the students to pose a question that would be a logical first step to better understand the evolutionary history of the group. Which student question would be the best starting point?
a) Can we investigate the genetic relationships between species A and G?
b) Can we evaluate evidence to determine the relationships of species D, E, and F?
c) Can we compare DNA evidence for taxa B and C?
d) Can we evaluate the DNA sequence of taxon G?
e) x
What member of a gene pair is called?
Each member of a gene pair is called an allele.
Alleles are different versions of the same gene that are located at the same position on a pair of homologous chromosomes. Humans, like most diploid organisms, inherit one allele of each gene from each parent. The combination of alleles that an individual possesses determines their genotype, which in turn can influence their phenotype (observable traits). For example, the gene for eye color has multiple alleles, including brown, blue, and green. An individual's eye color is determined by the combination of alleles they inherit from their parents.
The relationship between an individual's genotype and their observable traits, or phenotype, can be complex and influenced by a variety of factors.
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when you encounter a stressor, the sympathetic nervous system regulates the body to group of answer choices increase heart rate. dilate pupils. dilate coronary arteries. do all of the above.
Raising heart rate by pumping extra blood & oxygen to the muscles, this gets them ready for action. When you are exposed to a stressor, your sympathetic nervous system begins to work.
What is the sympathetic nervous system?The ability of our sympathetic nervous system to react to risky or stressful conditions is its most well-known function. When this happens, our sympathetic nervous system kicks in to help you escape danger by increasing your heart rate, pumping more blood to the parts of your body that need it, and other responses.
What kind of sympathetic nervous system is that?The sympathetic nervous system has the ability to increase blood pressure, enlarge bronchial passageways, decrease large intestine motility, constrict blood vessels, produce pupil dilation, generate goose bumps, and increase heart rate.
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The sympathetic nervous system triggers the body's "fight or flight" reaction when you are exposed to stressors. The goal of this reaction is to have the body ready to deal with threats or prospective threats.
The sympathetic nervous system activates when you come across a stressor?When this happens, your sympathetic nervous system kicks in to help you escape danger by increasing your heart rate, pumping more blood to areas of your body that need it, and other responses.
What impact does the sympathetic nervous system have on heart blood flow?Myocardial blood flow is increased by increased sympathetic activity due to the dilation of coronary resistance arteries. Endothelial function appears to be controlled, at least in part, by this vasodilator response.
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Where is the largest percentage of blood in the body found?
Answer:
The greatest volume is found in the venous vasculature.
I Hope this helps... :)
What type of blood vessel is built to handle the highest pressure of any vessel in the cardiovascular system? A) muscular artery B) metarterioles E) conducting correct C) arterioles F) all are correct D) veins G) none
The type of blood vessel built to handle the highest pressure of any vessel in the cardiovascular system is the A) muscular artery.
What is cardiovascular system?The cardiovascular system, also known as the circulatory system, is the organ system that is responsible for circulating blood, oxygen, and nutrients throughout the body. It consists of the Blood, blood vessels (arteries, veins, and capillaries), and heart. The heart pumps oxygen-rich blood to the body's tissues and organs through a network of blood vessels. The cardiovascular system also helps remove waste products from the body, including carbon dioxide, through the process of circulation.
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what has lead to the evolution of antibiotic resistant bacteria?
Overuse of antibiotics, has lead to the evolution of antibiotic resistant bacteria.
The Antibiotic resistance occurs naturally, but misuse of antibiotics in humans is one of the main reasons.
This resistance does not depends upon the age
The mutations which happen in the gene of bacteria which causes disease even after antibiotics their role is to pass these genes along to their descendants and this is how antibiotic-resistant strains of bacteria are formed.
disadvantage of antibiotic resistant bacteria is that now it may leads to higher medical costs, longer hospital stays, and increased death rates.
even after new medicine development the threat will still exists,
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Which of these is a negative form of a plant tropism?
1.shoot gravitropism
2.phototropism
3.pea plant thigmotropism
4.root gravitropism
The negative form of a plant tropism is the shoot gravitropism. Therefore, the correct option is 1.
What is plant tropism?Plant tropism is a biological phenomenon in which a plant organism grows or bends in response to a stimulus, such as light or gravity.
There are several types of plant tropisms, including:
Phototropism: This is the growth response of a plant to light.Gravitropism: This is the growth response of a plant to gravity.Hydrotropism:This is the growth response of a plant to moisture. Thigmotropism:This is the growth response of a plant to touch.Shoot gravitropism is a negative form of plant tropism, as here the shoot is growing upwards against the pull of gravity. Hence, the correct option is 1.
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Match each organism with the correct type of body cavity.
Photograph of a jellyfish emanating a bright white and yellow light in the dark background with few tiny jellyfishes around.
The organism pictured is a jellyfish, which has a gastrovascular cavity. This type of cavity is a simple, single-opening system that functions as both a digestive and circulatory system.
Question: Positive And Negative Energy Balance A Healthy Weight Can Be Achieved By Increasing Focus On The Importance Of Energy Balance. Determine Whether Each Label Is A Component Of The "Energy Input Or The Energy Output Side Of The Energy Balance Equation Drag The Label To Its Appropriate Classification Energy Input Energy Output Walking With Friends Digesting A
Energy input : digesting of meal, eating a grilled chicken salad.
Energy output : walking with friends, shivering in response to cold( as heat), drinking of wine( increase basal metabolic rate).
What is the relationship between energy input and energy output known as?The ratio of an energy conversion machine's useful output to its input, expressed in energy, is known as energy conversion efficiency (). Chemical, electric power, mechanical work, light (radiation), or heat can be used as inputs or useful outputs.The prevalent climatic conditions, the technique used, and the kind of digestion all affect the energy inputs for anaerobic digestion (thermophilic, mesophilic, etc.). Energy inputs, broadly speaking, comprise the energy equivalents of depreciation on machinery, energy to heat the digestors, and electricity to run the process. Additionally, it might include expenses for gathering, moving, and preparing biomass waste as well as storing gas.
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what is the function of the part of the eye identified by the arrow?
It directs illumination to the retina. It enables light to reach the eye. It shields the eye and starts to concentrate light. It has cells that are photoreceptors.
Iris: The coloured portion of a eye that encircles the pupil is known as the iris. It controls how much light gets into the eye. The cornea's dome shape bends light as it travels through, allowing your eye to focus upon small details. Including the retina, additional visual elements including the pupil, iris, and lens aid in directing light rays towards the retina. The cornea, which functions like a camera lens, is where light concentrates most. By changing the pupil's size, the iris regulates the amount of light entering the eye.
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in snapdragons, red flower color (cr) is incompletely dominant to white (cw); the cr/cw heterozygotes are pink. a red-flowered snapdragon is crossed with a white-flowered one. determine the flower color of: a. the f1 snapdragons b. the f2 snapdragons c. the progeny of a cross of the f1 snapdragons to the red parent
The genotypes of the F1 offspring will all be CR/CW. The F2 snapdragons will have a 1:2:1 genotype ratio of CR/CR:CR/CW:CW/CW. The progeny of a cross of the f1 snapdragons to the red parent is CR/CR:CR/CW and a 1:1 phenotype ratio of red:pink.
a. The F1 snapdragons will be all pink, since the red-flowered parent is homozygous dominant (CR/CR) and the white-flowered parent is homozygous recessive (CW/CW).
b. The f2 snapdragons will have 1:2:1 phenotype ratio of red:pink:white this is because the CR/CW heterozygotes will exhibit the intermediate phenotype of pink.
c. Crossing the F1 snapdragons with the red-flowered parent will result in a 1:1 genotype ratio.
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Complete the sentence. Changes in normal __________ patterns hurt agricultural and pastoral communities.
movement
harvesting
weather
feeding
Answer:
Explanation:
weather
e. coli can synthesize the amino acid threonine or absorb it from the environment. in the thr operon, the repressor is active when it is bound to threonine. if an e. coli bacterium is in an environment where threonine is absent, will transcription of threonine synthesis genes take place? why or why not? a) yes, because threonine will not be bound to the repressor, so the repressor will be inactive. b) no, because threonine will not be bound to the repressor, so the repressor will be inactive. c) yes, because threonine will not be bound to the repressor, so the repressor will be active. d) no, because threonine will not be bound to the repressor,
If an E. coli bacterium is in an environment where threonine is absent, the transcription of threonine synthesis genes will take place because threonine will not be bound to the repressor, so the repressor will be inactive. Option A is correct.
The threonine operon in E. coli contains genes that are involved in the synthesis of threonine. The repressor protein in the threonine operon is active when it is bound to threonine. When threonine is absent, the repressor is unable to bind to the operator, and the genes involved in threonine synthesis are transcribed.
This allows the bacterium to synthesize threonine when it is not present in the environment. When threonine is present, it binds to the repressor, making it active and preventing the transcription of the genes involved in threonine synthesis.
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a spore is a reproductive structure that contains a haploid cell and _____.
A spore is a type of reproductive structure that consists of a haploid cell and a protective coating.
A spore is a type of reproductive cell that can develop into a new individual without fusing with another. Spores differ from gametes, which are reproductive cells that must fuse in pairs to form a new individual. Asexual reproduction agents are spores, whereas sexual reproduction agents are gametes. Spores are produced by bacteria, fungi, algae, and plants. Bacterial spores primarily serve as a resting, or dormant, stage in the bacterial life cycle, assisting in bacterium preservation during periods of unfavorable conditions. Bacillus and Clostridium bacteria, several of which are pathogenic, are particularly prone to spore production. Many bacterial spores are extremely long-lived and can germinate even in extreme conditions.
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The biological species concept is inadequate for grouping. A) plants. B) parasites. C) asexual organisms. D) animals that migrate. E) sympatric populations.
The idea of biological species is inadequate for classifying asexual organisms.
Organisms that reproduce asexually are not considered to be biological species. As this idea is predicated on the mating of many species, it cannot be applied to asexual organisms because their DNA variations are what cause them to reproduce.
The Biological Species Idea, which is the most often used definition, describes a species as a group of creatures that may interbreed and produce fertile offspring. Limitations apply to the biological species concept as well. Dandelions and other single-reproducing organisms like bacteria don't always interbreed in order to reproduce.
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a 9:3:3:1 ratio of phenotypes in the f2 generation of a dihybrid cross a. indicates that the dihybrid cross is basically equivalent to two independent monohybrid crosses. b. holds true only for genes on the same chromosome. c. is not indicative of independent assortment. d. indicates that an epistatic relationship exists between the two genes under investigation.
a) This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort independently into gametes.
Cross involving two contrasting characters is called a dihybrid cross. The two flowers of each trait assort at random and independent of their traits and get randomly as well as independently rearranged in the offspring producing both parental and new combinations of traits.This ratio can be predicted using a Punnett square to reveal possible outcomes of a genetic cross. In the resulting F2 generation: About 9/16 of F2 plants will have round, yellow seeds; 3/16 will have round, green seeds; 3/16 will have wrinkled, yellow seeds; and 1/16 will have wrinkled, green seeds.
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How does a spreading center ridge like the East Pacific Rise explain the existence of the Marianas Trench?
The existence of the Marianas Trench and the spreading center ridge of the East Pacific Rise are two different expressions of plate tectonic activity, with the Marianas Trench being a site of subduction and the East Pacific Rise being a site of sea-floor spreading.
What is the Marianas Trench?A spreading center ridge, such as the East Pacific Rise, is a place where magma rises from the mantle and pushes the Earth's crust apart. The magma solidifies to form new oceanic crust, which spreads away from the ridge in opposite directions. Over time, this process creates new oceanic crust and increases the size of the ocean basin.
The presence of a spreading center ridge, like the East Pacific Rise, and the existence of the Marianas Trench are related through plate tectonics. The plate tectonic theory explains that the Earth's crust is divided into a number of large, moving plates that interact with each other at plate boundaries. At the boundary between the Pacific Plate and the Mariana Plate, the Pacific Plate is being subducted beneath the Mariana Plate, forming the Marianas Trench. On the other side of the Mariana Plate, the East Pacific Rise is spreading new oceanic crust and increasing the size of the Pacific Ocean.
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selection is the evolutionary process by which individuals of a species best adapted to their environment are the ones that survive and reproduce.
The process through which populations of living things adapt and change is known as natural selection. A population's members are naturally varied, which means that they are all distinctive in some ways.
This variation indicates that some people have more environment-appropriate characteristics than others. People with advantageous characteristics, or adapted traits, are more likely to live and reproduce. These people then pass on their adaptability traits to the next generation. These advantageous characteristics spread throughout the population over time. Natural selection causes advantageous characteristics to be passed down through generations. Natural selection can lead to specialization, the process by which one species gives rise to a completely different species. It is one of the processes that drives evolution.
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How does albedo relate to the reflectivity of an object?
Albedo and reflectivity are closely related terms that describe how much light is reflected by an object.
Different between Albedo and reflectivityAlbedo is a measure of the diffuse reflectivity of a surface, which is the fraction of incoming light that is reflected by an object without taking into account the angle of incidence or the direction of reflection. Reflectivity, on the other hand, is a measure of the overall reflectance of a surface, which takes into account both the diffuse reflectivity and the specular reflectivity (the amount of light reflected in a single direction).
Albedo is the proportion of solar energy that a surface reflects while the ability of an object to reflect solar energy is known as reflectivity.
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Which of the following is called as the brain of the cell?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Plasma membrane
Answer:
Brain of the cell:
Nucleus
Cellular processes are occurring in our bodies every second of every day. There are many mechanisms behind the methods of cellular transport. Your task is to read each case summary and determine a suspect based on evidence.
Possible Suspects: Osmosis Sally, Maggie Diffusion, Jenny Active Transport
Crime Description:
The suspect was reported to have quietly entered “CellBuck’s Coffee House” which was sparsely populated on that foggy Saturday morning on March 17, 2012. The first witness reported that the suspect glided into the establishment like a ghost. The suspect was reported to have floated about the room spreading her aromatic charm. The suspect is accused of stealing Mike Hematocyte’s wallet as she charmed him with her hypnotic aroma. The men that she touched during this experience were reported to have been so mesmerized that they could not recall her features. The female witness stated that just before she left, it was as if she was a magician floating through the air as she disappeared from the establishment back into the foggy mist.
The suspect based on evidence is Maggie Diffusion.
What evidence proves that?
The description of the suspect "gliding into the establishment like a ghost" and "floating about the room spreading her aromatic charm" suggest a passive and effortless movement, which is consistent with the mechanism of diffusion.
We know that during diffusion, substances move from an area of high concentration to low concentration, without the use of energy.
Another evidence is the fact that the men who were touched by the suspect were reported to have been "mesmerized" and "could not recall her features" which also suggests a chemical or biological process at work, which could also be related to diffusion of a substance that affected their perception.
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what is the mostly phylogenetic tree based on these shared derived characters? When did these characters appear during the aliens'evolutionary history? Drag the lens and shared derived characters to their appropriate locations on this phylogenetic tree.
A derived feature is one that emerged in the lineage before a clade and distinguishes individuals of that group from other people, whereas a sharing character is a characteristic that multiple lineages share.
Describe a lineage.Lineages are collections of organisms linked together by ancestry-descent relationships. My father, my grandpa, and I make up a lineage because we are all descended from a single, common ancestor.
Why does lineage significant?A person can develop a stronger sense of themselves by understanding about their family's history, including where they came from, the people they were, what those who did, the struggles they faced, the successes they attained, and the goals they had.
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Need this for a assignment please reply ASAP!
The moss and the algae are non vascular plants
The seed plant would be in the same group as the fern
What is the categorization of moss and AlgaeThe moss and the algae belong to the same category of non-vascular plants. They lack true roots, stems, and leaves, and do not have specialized vascular tissues for transporting water and nutrients. In contrast, the fern has true roots, stems, and leaves and contains vascular tissues, so it is categorized as a vascular plant.
Part B: Another organism that would be categorized into the same group as the fern is a seed plant (e.g., gymnosperm or angiosperm). Both ferns and seed plants are vascular plants with true roots, stems, and leaves. However, seed plants differ from ferns in that they produce seeds for reproduction, whereas ferns produce spores.
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calculate the rates of kinetic energy for (a) blood in the aorta and (b) blood in an average capillary. report your answers in units of w and btu/s. the density of blood is 1.056 g/cm3 .
A-the kinetic energy rate for blood in the aorta is approximately 2067 W or 1.96 BTU/s. B- the kinetic energy rate for blood in an average capillary is approximately 1.32x[tex]10^{-11}[/tex] W or 1.25x[tex]10^{-14}[/tex]BTU/s.
To calculate the kinetic energy rate for blood in the aorta and an average capillary, we need to use the following formula:
KE = (1/2) x m x v. where KE is the kinetic energy, m is the mass, and v is the velocity.
To convert the units of KE to watts (W) and BTU/s, we use the following conversions:
1 W = 1 J/s
1 BTU/s = 1055.06 J/s
(a) Blood in the Aorta:
The velocity of blood in the aorta is approximately 35 cm/s
The cross-sectional area of the aorta varies between individuals and depends on factors such as age, sex, and body size. However, for a typical adult, the cross-sectional area of the aorta is approximately 3.14 cm
Therefore, the mass of blood in the aorta can be calculated as follows:
mass = volume x density
= area x length x density
= (3.14 cm) x (10 cm) x (1.056 [tex]g/cm^{3}[/tex])
= 33.2 g
Now, we can calculate the kinetic energy rate for blood in the aorta:
KE = (1/2) x m x v
= (1/2) x (33.2 g) x (35 cm/s)
= 2067 J/s = 2067 W
= 1.96 BTU/s
Therefore, the kinetic energy rate for blood in the aorta is approximately 2067 W or 1.96 BTU/s.
(b) Blood in an Average Capillary:
The velocity of blood in a capillary is much slower than in the aorta and depends on several factors such as the diameter of the capillary and the viscosity of blood. The velocity of blood in a typical capillary is approximately 0.5 mm/s
The cross-sectional area of a typical capillary is approximately 5x[tex]10^{-5}[/tex]cm
Using the same density of blood (1.056 g/cm3), we can calculate the mass of blood in a capillary as follows:
mass = volume x density
= area x length x density
= (5x[tex]10^{-5}[/tex] cm) x (1 cm) x (1.056 g/cm3)
= 5.28x[tex]10^{-8}[/tex] g
Now, we can calculate the kinetic energy rate for blood in a capillary:
KE = (1/2) x m x v
= (1/2) x 5.28x[tex]10^{-8}[/tex] g) x (0.5 mm/s)
= 1.32x[tex]10^{-11}[/tex]W
= 1.25x[tex]10^{-14}[/tex]BTU/s
Therefore, the kinetic energy rate for blood in an average capillary is approximately 1.32x[tex]10^{-11}[/tex] W or 1.25x[tex]10^{-14}[/tex]BTU/s.
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the effects of genetic drift are more pronounced in smaller populations. t/f
False, the effects of genetic drift are more pronounced in smaller populations.
One of the factors that leads to evolution is genetic drift, which is an abrupt and haphazard process. Allele frequency fluctuates as a result of genetic drift. This alteration could be brought on by the bottleneck effect, population migration or emigration, or some other factor (when some calamity causes destruction of most of the members and only a few members survive). Additionally, the founder effect may be to blame (some members of the population segregate themselves and live as a separate population).
Due to the relatively low genetic variability in these populations, even slight changes in the allelic frequency can have a significant impact on the population. Small populations are more susceptible to genetic drift.
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As men progress through middle adulthood they experience a ________ sperm count and a ________ in testosterone level.a. decline in; decline inb. rise in; rise inc. stabilization in; decline ind. rise in; stabilization ine. decline in; rise in
A loss in fertility is one of the most conspicuous phases of physical ageing that happens in middle majority. Over time, men's sperm counts and testosterone situations decline, and they may start to develop sexual dysfunction that was not apparent when they were youngish.
Middle age is the period of life between the periods of 40 and 65. People go through a number of physical changes known as the middle age spread, or the spread of slate hair and hair loss, wrinkles and age spots, loss of sight and hail, and weight increase, during this time. Our olfactory function deteriorates with age. We not only lose our sense of smell, but also our capacity to distinguish between different smells.
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Does the epidermis layer have blood vessels?
This area of skin is dependent mostly on dermis, which is the skin layer that lies immediately underneath the epidermis because it lacks blood vessels.
What does the skin's epidermis mean?The topmost layer of skin in your body is called the epidermis. It defends your body from damage, keeps you hydrated, regenerates skin cells, and includes melanin, which gives your skin its colour.
What in biology is an epidermis?The epidermis is the exterior sheet of cells that covers an organism, specifically the surface mucosa of an animal's skin. It is also the outermost layer of tissue of a plant, with the exception of places where periderm takes its place. 1) These epidermal cells shield the cells underneath them.
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Into which two subcategories can bulk transport be divided?A) Endocytosis and osmosisB) Endocytosis and exocytosisC) Exocytosis and passive transportD) Osmosis and facilitated diffusion
The two subcategories can bulk transport be divided are B) Endocytosis and exocytosis.
What are the cell processes of endocytosis and exocytosis?The cell processes of endocytosis and exocytosis make reference to the transport of substances inside the cell in the case of endocytosis and outside the cell in the case of exocytosis, which are fundamental to taking nutrients and eliminating waste products, respectively.
Therefore, with this data, we can see that the cell processes of endocytosis and exocytosis are required to obtain nutrients from the media and also to remove byproducts in the cell.
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A ______ is the protective covering made up of glial cells.
A protective covering known as the myelin sheath insulates most axons as well. Glial cells with specialised functions form the myelin sheath, which encircles the axon.
The peripheral nervous system's Schwann cells sheath the neurons, while the central nervous system's neurons are insulated by oligodendrocytes. By the time a child is five years old, the majority of the myelination process is finished, but the process continues until the fourth decade of life. The nodes of Ranvier found in myelinated axons allow electrical impulses to spread quickly because of their uniform spacing.
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