The system in people most similar to Gina's diagram of the movement of water and nutrients throughout a plant is the circulatory system.
The circulatory system in humans is responsible for transporting nutrients, oxygen, and water throughout the body, much like the movement of water and nutrients in a plant.
In plants, this function is carried out by the vascular system, which includes the xylem and phloem tissues.
Thus, the human circulatory system and the plant's vascular system share a similar role in distributing essential elements for the proper functioning and growth of the organism.
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How long ago did our human haplogroups diverge?
Select one:
a. Decades ago
b. Hundreds of years ago
c. A thousand years ago
d. Tens of thousands of years ago
e. A million years ago
D. Tens of thousands of years ago, our human haplogroups diverge.
Human haplogroups refer to specific groups of genes that are inherited together and passed down through generations. These haplogroups can help us trace our ancestry and migration patterns. Studies have shown that the most recent common ancestor of all humans lived in Africa around 200,000 years ago. Since then, human populations have migrated and diverged, leading to the development of different haplogroups. The exact timing of these divergences is not always clear, but based on genetic evidence, it is believed that our human haplogroups diverged tens of thousands of years ago.
In conclusion, our human haplogroups diverged tens of thousands of years ago, as a result of migration and genetic variation. This information can provide insight into our evolutionary history and ancestry.
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within the limbic system, sensory information is to emotion as the _____ is to the _____.
Within the limbic system, sensory information is to emotion as the amygdala is to fear. The amygdala is a small, almond-shaped structure located deep within the temporal lobes of the brain.
It plays a crucial role in the processing and regulation of emotions, particularly fear and anxiety. When sensory information enters the brain, it is first processed in the thalamus before being sent to the amygdala for evaluation. If the amygdala perceives the information as a potential threat, it triggers the "fight or flight" response, which prepares the body to respond to the perceived danger.
This response includes increased heart rate, rapid breathing, and heightened senses. The amygdala also plays a role in the formation of emotional memories and helps to guide our behavior in response to different emotional stimuli. Overall, the amygdala is an essential component of the limbic system, working in conjunction with other brain regions to regulate emotional responses.
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what would happen to a plant that had a mutation preventing it from being able to perform phototropism? compare to a plant with a mutation that allows it to do phototropism more quickly than other plants. explain in terms of natural selection.
If a plant had a mutation preventing it from performing phototropism, it would likely have a disadvantage in terms of survival and reproduction.
Phototropism is the ability of a plant to grow towards a light source, which is important for its ability to photosynthesize and produce energy. Without this ability, the plant may not be able to efficiently gather enough energy from the sun to sustain itself, and would therefore be at a disadvantage compared to other plants in the same environment. As a result, it is likely that this mutation would be selected against in natural selection, as plants without the ability to perform phototropism would be less likely to survive and pass on their genes to future generations.
In conclusion, the ability to perform phototropism is an important adaptation for plants, and mutations that affect this ability can have significant impacts on their ability to survive and reproduce. Mutations that prevent phototropism may be selected against in natural selection, while mutations that allow for faster phototropism may be selected for. Ultimately, natural selection acts on these mutations to shape the characteristics of plant populations over time.
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a skeletal muscle with slower atpase activity can complete more crossbridge cycles per second.
T/F
False. ATPase activity is directly related to the speed at which muscle fibers can contract and relax. A muscle with slower ATPase activity will take longer to break down ATP into ADP and Pi, which is required for the power stroke of the crossbridge cycle.
This means that the muscle will contract and relax more slowly, and therefore complete fewer crossbridge cycles per second. Conversely, a muscle with higher ATPase activity will contract and relax more quickly, allowing it to complete more crossbridge cycles per second. So, a skeletal muscle with slower ATPase activity cannot complete more crossbridge cycles per second.
The statement "A skeletal muscle with slower ATPase activity can complete more crossbridge cycles per second" is false.
Step-by-step explanation:
1. Skeletal muscles contain two types of fibers: slow-twitch (Type I) and fast-twitch (Type II).
2. Slow-twitch fibers have slower ATPase activity, while fast-twitch fibers have faster ATPase activity.
3. Crossbridge cycling is the process of myosin heads binding to actin, pulling the actin filaments, and releasing them, resulting in muscle contraction.
4. Slower ATPase activity means that ATP is hydrolyzed more slowly, leading to a slower crossbridge cycle and slower muscle contractions.
5. Therefore, skeletal muscles with slower ATPase activity actually complete fewer crossbridge cycles per second compared to muscles with faster ATPase activity.
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how is dna packaged to fit into the small space of a cell nucleus?
DNA is packaged in the cell nucleus through a process called chromatin condensation. DNA molecules are wrapped around proteins called histones to form nucleosomes.
These nucleosomes are then coiled and compacted further, forming a fiber-like structure known as chromatin. Further folding and compaction of chromatin result in the formation of chromosomes, which are highly condensed structures during cell division. This packaging allows the DNA to fit within the limited space of the cell nucleus. In more detail, the DNA double helix is wound around histone proteins to form nucleosomes. Each nucleosome consists of a core of eight histone proteins with DNA wrapped around them. The nucleosomes are connected by linker DNA, forming a "beads on a string" structure. This chromatin fiber is then folded and compacted into a more condensed structure through interactions with other proteins, including non-histone proteins. This compaction is critical for efficient storage and organization of DNA within the nucleus, enabling proper gene regulation and DNA replication.
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the long, tightly coiled tube that is attached to the outer wall of each testis is the ________.
The long, tightly coiled tube that is attached to the outer wall of each testis is the epididymis.
It is a highly convoluted tubule that is responsible for storing and maturing sperm before they are ejaculated. The epididymis is located on the posterior surface of each testis and is about 6 meters long when uncoiled. The epididymis consists of three main parts: the head, the body, and the tail. The head of the epididymis is where the sperm enter after leaving the testis. As the sperm travel through the epididymis, they mature and become motile. By the time they reach the tail of the epididymis, they are fully mature and ready for ejaculation. Overall, the epididymis plays a crucial role in the development and transport of sperm in the male reproductive system.
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If one wants to measure Bgalactosidase activity under different conditions, it is important to take cell density into account primarily because:
Cell density can affect the amount of Bgalactosidase produced, which can impact the accuracy of the measurement.
Bgalactosidase is an enzyme that breaks down lactose into glucose and galactose. The amount of Bgalactosidase produced can vary depending on the conditions, such as temperature, pH, and nutrient availability. However, cell density can also impact the amount of Bgalactosidase produced, as higher cell density can lead to lower levels of the enzyme.
This is because the cells can use up the nutrients needed for Bgalactosidase production more quickly at higher densities. Therefore, when measuring Bgalactosidase activity under different conditions, it is important to take cell density into account in order to accurately assess the impact of other factors. Failure to consider cell density could result in inaccurate measurements and misinterpretation of the results.
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What does luria broth do?
Luria Broth, also known as Luria-Bertani (LB) broth, is a nutrient-rich medium used for the growth and maintenance of bacteria, particularly Escherichia coli (E. coli).
Luria Broth, also known as Luria-Bertani (LB) broth, is a nutrient-rich medium used for the growth and maintenance of bacteria, particularly Escherichia coli (E. coli). The broth contains essential components such as tryptone, yeast extract, and sodium chloride, which provide the necessary nutrients, vitamins, and minerals for bacterial growth.
Tryptone and yeast extract serve as sources of amino acids, peptides, and other growth factors required for bacterial replication. Sodium chloride maintains the osmotic balance within the medium. Luria Broth is commonly used in molecular biology and microbiology research, as it facilitates the growth and multiplication of bacterial cells, allowing for easier observation, experimentation, and transformation.
In summary, Luria Broth plays a crucial role in bacterial research by providing a conducive environment for their growth and reproduction, enabling scientists to conduct various experiments and gain insights into bacterial behavior and molecular biology.
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I grow inside living trees and slowly digest their wood, making it rot. I got inside the tree back when I was a spore that landed on a wound made by a weed eater. My body is a whitish, thread mass called a mycelium. I eventually kill my host tree. who am I ?
It is a wood-decaying fungus which grow inside living trees and slowly digest their wood, making it rot.
Wood-decaying fungi are organisms that primarily grow inside living trees and digest their wood, causing it to rot.
They enter the tree as spores, often through wounds created by external factors such as a weed eater. Once inside, they develop a whitish, thread-like mass called a mycelium, which spreads throughout the tree and absorbs nutrients from the wood.
Over time, the decay caused by the fungus weakens the tree, and it may eventually die as a result.
In summary, you are a wood-decaying fungus that grows inside living trees, causing them to rot and potentially leading to their death.
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There are three principal types of bonds that hold multiple atoms together. these are: ____
The three principal types of bonds that hold multiple atoms together are:
Covalent bonds: These bonds are formed by the sharing of electrons between two or more atoms. Covalent bonds can be polar or nonpolar depending on the electronegativity difference between the atoms involved.
Ionic bonds: These bonds are formed by the transfer of electrons from one atom to another, resulting in the formation of positively and negatively charged ions that are attracted to each other.
Metallic bonds: These bonds are found in metals and are formed by the sharing of electrons between a lattice of positively charged metal ions and a sea of delocalized electrons. This creates a strong, cohesive force that holds the metal together.
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the smell receptors that actually bind the odorants and begin signal transduction are located on
The smell receptors that bind odorants and initiate signal transduction are located in the olfactory epithelium, which is located in the upper part of the nasal cavity.
The olfactory epithelium is a specialized tissue that contains millions of receptor cells called olfactory receptor neurons. These neurons have hair-like projections called cilia that are covered in odorant receptors. When odor molecules enter the nasal cavity, they bind to these receptors, triggering a series of biochemical reactions that send signals to the brain, which is responsible for interpreting these signals as specific smells.
the smell receptors that actually bind the odorants and begin signal transduction are located on the olfactory receptor neurons.
Olfactory receptor neurons are specialized sensory cells found in the olfactory epithelium, a tissue within the nasal cavity. These neurons have hair-like projections called cilia that extend into the mucus layer covering the epithelium. Odorant molecules bind to specific olfactory receptors on the cilia, initiating signal transduction and ultimately leading to the perception of smell.
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at approximately what age is a baby able to prominently open its hand and grasp a rattle?
Four students collected data on the weather. The table below shows the information recorded
by each student.
Name Information recorded
Jenny
Mark It is hotter than most June days.
Ali
The high temperature was 39 °C.
Chen The heat is making people sweat.
Which student recorded an observation that can be tested and verified?
A Jenny
(B) Mark
C Ali
D Chen
a cell is considered cancerous when it acquires a mutation that makes it unable to regulate its cell cycle and, as a result, divides more often than a normal, healthy cell.based on the increased energy demands of this condition, what would you expect to be true about glycolysis in cancer cells?
In cancer cells, the energy demands are significantly higher than normal cells due to their rapid and uncontrolled division.
In cancer cells, the energy demands are significantly higher than normal cells due to their rapid and uncontrolled division. As a result, cancer cells rely heavily on glycolysis, which is a metabolic process that breaks down glucose to produce energy. Glycolysis is a less efficient way of producing energy compared to cellular respiration, which is the primary method used by healthy cells. However, cancer cells are known to undergo a phenomenon called the Warburg effect, where they rely more on glycolysis to meet their energy demands even when oxygen is available, rather than using cellular respiration. This increased reliance on glycolysis is thought to be due to the fact that glycolysis produces energy faster than cellular respiration and also provides intermediates for biosynthesis, which is essential for cancer cell growth and proliferation. Thus, the upregulation of glycolysis is a hallmark of cancer cells and has become an attractive target for cancer therapy.
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what mythical creature are brown eyes descended from
Brown eyes are not descended from a mythical creature. The color of a person's eyes is determined by genetic variations and the presence of specific pigments in the iris.
Eye color is primarily influenced by the amount and distribution of the pigment called melanin in the iris, the colored part of the eye. The two main pigments involved in eye color are eumelanin, which appears brown or black, and pheomelanin, which appears yellow or red. The combination and concentration of these pigments determine the color of the eyes.
The genetics of eye color is complex and involves multiple genes. Brown eye color is often associated with higher levels of eumelanin in the iris, while blue or green eye color is associated with lower levels of eumelanin and higher levels of pheomelanin.
There is no direct ancestral link between brown eyes and any mythical creature. Eye color variation is a result of natural genetic variation and does not have a mythical or legendary origin.
Eye color, including brown eyes, is determined by genetic factors and the presence of specific pigments in the iris. It is not descended from a mythical creature. The diversity of eye colors observed in humans is a natural result of genetic variation and does not have a mythical or supernatural explanation.
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if you perform the heimlich maneuver on another person, you're pushing on the _________ muscle
If you perform the Heimlich maneuver on another person, you're pushing on the diaphragm muscle.
The Heimlich maneuver is a technique used to dislodge an object stuck in the throat of a choking person. It involves standing behind the person and applying pressure with your hands to the upper abdomen, just below the ribcage.
This pressure can compress the diaphragm muscle, which sits at the base of the chest cavity and separates the chest from the abdomen. When the diaphragm muscle contracts, it helps to pull air into the lungs.
However, in the case of choking, the pressure applied during the Heimlich maneuver can help to dislodge the obstructing object and allow air to flow more easily into the lungs.
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an individual with the genotype aabbccdd can make how many different kinds of gametes?
An individual with the genotype aabbccdd can produce 16 different kinds of gametes.
To determine the number of different gametes that an individual with the genotype aabbccdd can produce, we need to consider the number of different alleles for each gene. In this case, there are four different genes (a, b, c, and d) with two alleles each (A/a, B/b, C/c, and D/d).
To calculate the number of possible gametes, we can use the multiplication rule of probability, which states that the probability of two independent events occurring together is equal to the product of their individual probabilities. In this case, we can apply this rule to the different alleles for each gene.
2 (possible gametes for gene a) x 2 (possible gametes for gene b) x 2 (possible gametes for gene c) x 2 (possible gametes for gene d) = 16
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how does synaptic wiring allow the brain to learn, memorize, and change?
Synaptic wiring plays a crucial role in allowing the brain to learn, memorize, and change.
Synaptic wiring refers to the connections between neurons in the brain, which are responsible for transmitting information. When we learn something new, our brain creates new connections between neurons or strengthens existing ones, forming new neural pathways. These pathways are used to store and retrieve information, which is how we memorize things.
Furthermore, synaptic wiring allows the brain to change and adapt to new experiences. The brain has the ability to modify its neural connections in response to environmental stimuli and experiences, a process called neuroplasticity. This enables us to learn new skills, develop new habits, and even recover from brain injuries.
In summary, synaptic wiring is essential for learning, memorizing, and changing as it allows the brain to form new connections, store and retrieve information, and adapt to new experiences through neuroplasticity.
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a bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because
A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because these traits are influenced by multiple genes as well as environmental factors, resulting in a continuous range of phenotypes with the majority of individuals clustering around the mean.
This distribution pattern is also known as a normal distribution or Gaussian distribution, and it is commonly observed in nature for many traits, such as height, weight, and intelligence. The bell curve allows for easy visualization and analysis of the trait's variability and the contribution of genetic and environmental factors to its expression.
A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because it represents the combined effects of multiple genetic and environmental factors. This results in a continuous range of phenotypic variation, with the majority of individuals exhibiting a phenotype near the mean and fewer individuals at the extreme ends. This creates a symmetrical, bell-shaped distribution of phenotypes in the population.
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how do enzymatic catalysts increase the rates of reactions? select all that apply.
Enzymatic catalysts increase the rates of reactions by lowering the activation energy required for the reaction to proceed, which allows the reaction to occur more easily and quickly. Enzymatic catalysts increase the rates of reactions by:
1. Lowering the activation energy required for the reaction to occur.
2. Providing a specific site for the reactants to bind and undergo a chemical reaction.
3. Changing the orientation or conformation of the reactants to favor the formation of the products.
4. Stabilizing the transition state of the reaction, allowing it to proceed more quickly.
5. Increasing the concentration of the reactants near the active site, promoting more frequent collisions between them.
6. Enhancing the selectivity of the reaction, allowing only the desired products to be formed.
They achieve this by stabilizing the transition state and aligning the substrates in a favorable orientation. Enzymatic catalysts are highly specific, ensuring that only the desired reaction occurs efficiently.
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Troponin, a major protein in thin filaments, is a globular protein with three polypeptide subunits. Which of the following is a function of the troponin?
- One subunit binds tropomyosin and helps position it on actin.
- One subunit attaches troponin to actin.
- One subunit binds to calcium ions.
Answer: One subunit of troponin binds to calcium ions.
Explanation: The binding of calcium ions to this subunit causes a conformational change in the troponin molecule, which in turn causes a movement of tropomyosin on actin filaments. This movement exposes the myosin-binding sites on actin, which allows myosin to bind and initiate muscle contraction. Another subunit of troponin binds to tropomyosin and helps position it on actin, but it is the calcium-binding subunit that plays a key role in regulating muscle contraction. The third subunit of troponin helps to stabilize the troponin-tropomyosin complex. Overall, troponin is an important regulatory protein that helps to control muscle contraction in response to calcium signals.
which of the following metabolic stages generates the majority of atp produced in the body? A. The oxidation of one molecule of glucose.
B. The anaerobic metabolism of one molecule of glucose.
C. The oxidation of a triglyceride with each fatty acid contains 24 carbons.
Answer: Which of the Following Metabolic Stages Generates the Majority of ATP Produced in the Body?
Explanation:
The answer is "A", "The oxidation of one molecule of glucose."
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the new cell formed by the union of the spermatozoon and the ovum is the
The zygote is the first stage of spermatozoon development in a new individual organism, and it contains the genetic material from both the sperm and the egg.
It is formed through the process of fertilization, which occurs when a sperm cell penetrates and fertilizes an egg cell. The zygote then begins to divide and grow, eventually developing into an embryo and eventually into a fetus. The new cell formed by the union of the spermatozoon and the ovum is called a zygote. This cell contains the genetic material from both the male and female parents and has the potential to develop into a new individual.
This process takes place in the female reproductive system, usually in the fallopian tube. Once fertilization occurs, the zygote begins to divide and grow rapidly, forming a blastocyst. The blastocyst then implants itself in the lining of the uterus, where it continues to develop into an embryo and eventually into a fetus. During the process of development, the zygote goes through several stages, including cleavage, gastrulation, and organogenesis, before it becomes a fully formed fetus.
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how does angiotensin ii increase the workload of the heart after a myocardial infarction (mi)?
Angiotensin II increases the workload of the heart after a myocardial infarction (MI) by constricting blood vessels and increasing blood pressure, leading to increased cardiac afterload and oxygen demand.
After a myocardial infarction, the heart's blood supply is compromised, resulting in tissue damage. Angiotensin II, a hormone, is released as part of the renin-angiotensin-aldosterone system (RAAS) in response to decreased blood flow.
Angiotensin II constricts blood vessels, causing vasoconstriction and an increase in systemic vascular resistance, which elevates blood pressure. This increased afterload, the resistance the heart must overcome to pump blood, places an additional burden on the weakened heart muscle.
Furthermore, angiotensin II stimulates the release of aldosterone, leading to sodium and water retention, further increasing blood volume and cardiac workload. Overall, these effects of angiotensin II contribute to increased oxygen demand and strain on the heart, exacerbating the post-MI workload.
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which term refers to a mass of undissolved matter lodged in a blood vessel?
An "embolus" is the term for undissolved matter lodged in a blood vessel.
A thrombus is a mass of undissolved matter that is lodged in a blood vessel and can obstruct blood flow.
An explanation of a thrombus is that it is typically composed of platelets, fibrin, and other blood components that have clumped together and formed a solid mass.
If a thrombus breaks loose and travels through the bloodstream, it is called an embolus.
In summary, a thrombus is a potentially dangerous obstruction in a blood vessel that can cause serious health problems.
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Which of the graphs below represents accuracy?
Graph D represents accuracy. Therefore, option D is correct.
Accuracy refers to the degree of correctness or precision of a measurement, calculation, prediction, or statement in relation to the true or expected value. It is a fundamental concept used to assess the reliability and validity of various processes and systems, including scientific experiments, statistical models, data analysis, and information retrieval.
It quantifies the absence of errors from the desired or expected outcome. Accuracy is often expressed as a percentage or a decimal value, representing the proportion or fraction of correct results.
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when there are a lot of available ecological niches, it is not uncommon to see:
When there are a lot of available ecological niches, it is not uncommon to see a high degree of biodiversity.
This is because when there are numerous ecological niches, different species can occupy and adapt to these diverse habitats, leading to the coexistence of a wide range of organisms. The availability of various niches allows for the specialization and diversification of species, leading to increased species richness and ecological complexity within an ecosystem. This phenomenon is observed in many ecosystems around the world where there is an abundance of resources and environmental heterogeneity, resulting in a rich array of species adapted to different niches.
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what were three inventions that needed to be invented before cells were discovered and why?
Together, these inventions paved the way for the discovery and understanding of cells, which have since become recognized as the fundamental unit of life.
Before the discovery of cells, there were several inventions that needed to be developed in order to facilitate the discovery and understanding of cells. Three key inventions are:
The compound microscope: The compound microscope was a crucial invention that allowed scientists to observe small objects and organisms at high magnifications. It was invented in the 16th century by Antonie van Leeuwenhoek and Robert Hooke. The compound microscope allowed scientists to observe microorganisms and plant and animal tissues at the cellular level, which ultimately led to the discovery of cells.
The development of lenses: The development of high-quality lenses was a critical step in the invention of the microscope. The lenses needed to be finely crafted and free of distortions in order to produce clear images. The quality of the lenses improved over time, allowing for more detailed observations of cells and other microscopic objects.
The invention of staining techniques: Early microscopists struggled to observe cells because they were often transparent and difficult to see. The invention of staining techniques in the 19th century allowed scientists to selectively color different structures within cells, making them easier to observe. Stains such as hematoxylin and eosin are still commonly used in microscopy today.
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56)57) Which of the following is NOT a property of glycolytic fibers as compared to oxidative fibers?A) poor ability to produce ATP in the absence of oxygenB) fewer capillariesC) high capacity for lactic acid production57)
The poor ability to produce ATP in the absence of oxygen is not a property of glycolytic fibers as compared to oxidative fibers. Therefore, option A is correct.
Glycolytic fibers are the type of oxidative fibers that are distinguished based on the ability to create ATP by using anaerobic metabolism. The anaerobic metabolism means they can able to produce any kind of energy without the presence of oxygen.
When compared to oxidative metabolism, anaerobic metabolism is time taking process and only generates type I fibers. These glycolytic fibers have lower reactivity levels and consist of fewer capillaries which help in the continuous production of ATP.
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Which of the following changes are expected in vision as part of the normal aging process? A) Cataracts B) Glaucoma C) Macular degeneration D) Blurring of near vision
Answer:
D
Explanation:
Because the eye cannot be as clear as that of the young ones
