Each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber Shortens
Mechanism :
Myofibrils are components of the animal skeletal muscles that are made up of sacromeres. They perform the muscular contraction and relaxation via the sliding filament model.
To produce motion, A cross-bridge forms between actin and the myosin heads triggering shortening of the sacromere. This shortening of the sacromere results in the contraction of the muscle fibers, which the net effect can be seen to be a shortening of the fibers.
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Why do scientists refer to inputs and outputs of carbon in the environment as a cycle?
Answer:
Carbon flows between each reservoir in an exchange called the carbon cycle, which has slow and fast components. Any change in the cycle that shifts carbon out of one reservoir puts more carbon in the other reservoirs. Changes that put carbon gases into the atmosphere result in warmer temperatures on Earth
Explanation:
hope this answer helps you
It is important for the scientists to refer to inputs and outputs of carbon in the environment as a cycle as carbon continuously flows through these systems in the environment and it is a major biogeochemical cycle.
What is Carbon cycle?Carbon cycle is a major biogeochemical cycle. It involves the flow of Carbon between each reservoir present in the environment in an exchange, which has both slow and fast components. Any change in the carbon cycle shifts carbon out of one reservoir and puts more carbon into the other reservoirs. Changes that put carbon gases into the atmosphere results into warmer temperatures on planet Earth.
Carbon flows into stores that are called inputs, e.g. carbon dioxide added to the atmosphere by human activities such as respiration and pollution. Flows leaving stores are outputs, e.g. dissolved carbon carried from the land in solution by the rivers.
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Are microorganisms best suited for dry, warm environments?
Answer:
The most significant effect of the microbes on earth is their ability to recycle the primary elements that make up all living systems, especially carbon, oxygen, and nitrogen (N). Primary production involves photosynthetic organisms which take up CO2 from the atmosphere and convert it to organic (cellular) material.
what happens to the energy captured during glycolysis and the citric acid cycle by the activated carriers nadh and fadh2.
Energy is passed to an electron transport chain in order to produce a proton (H+) gradient across the inner mitochondrial membrane.
What is oxidative phosphorylation?Oxidative phosphorylation is the last and most energetically efficient step in cellular respiration.
Oxidative phosphorylation is based on the transport of electrons on carriers, which is coupled to the generation of a proton gradient.
In conclusion, energy is passed to an electron transport chain in order to produce a proton (H+) gradient across the inner mitochondrial membrane.
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PLEASE HELP MEEE WITH THIS QUESTION
Answer:
2) 6) 3) 4)
Explanation:
The following factors will affect the current oxygen and carbon dioxide levels.
Burning fossil fuels increases the output of CO2 outside of organisms that perform cellular respiration-CO2 is a green house gas and is a cause of global warming. burning fossil fuels will increase CO2 in the atmosphere which cannot be balanced by the natural sinks like forests and oceans.Deforestation reduces the number of photosynthetic organisms able to produce oxygen and consume carbon dioxide. Deforestation causes habitat loss and hence a large amount of tree cover is lost which will reduce the amount of oxygen generated and CO2 absorbed.When land is deforested for agriculture, the photosynthetic productivity of crops is not equivalent to the forests being replaced. This is so because forests have large trees and plants which have a greater photosynthesis capacity however new crops which are small and are removed annually are not able to compensate for the loss of large forest trees.learn more about oxygen and carbon dioxide levels here:
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What are the defining characteristics of lobe-finned fishes?
Lobe-finned fishes are characterized by lobes in their fins in addition to the basic characteristics of fishes.
What are lobe-finned fishes?Lobe-finned fishes are a group of fish known as Sarcopterygii. They possess the basic characteristics of fishes such as swim bladder, lateral lines, etc.
They are a sister group of ray-finned fishes. In addition, lobe-finned fishes possess the following characteristics:
lobed finsenameled teethMore on lobe-finned fishes can be found here: https://brainly.com/question/7849168
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Inversion, translocation, and nondisjunction are all examples of group of answer choices
a chromosomal mutations
b single gene mutations
c point mutations
d cellular mutations
Inversion, translocation, and nondisjunction are all examples chromosomal mutations. That is option A
What is chromosomal mutations?Chromosomal mutations is defined as the type of mutation that affects the Deoxyribonucleic acid segments.
Example of chromosomal mutations are:
Inversion: This type of mutation occurs when part of chromosomal segment breaks up and reunites to the segment in a reversed way.Translocation: This is a type of chromosomal mutation where by part of chromosome breaks up to reunite with another different chromosome.Nondisjunction: This is a type of chromosomal mutation where by there is failure of segregation in a pair of chromosome during anaphase of cell division.Therefore, Inversion, translocation, and nondisjunction are all examples chromosomal mutations.
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What is dynamic instability and why is it
necessary?
Dynamic instability helps is the frequent growth and shrinkage of microtubules at a constant rate and it helps in the organization of microtubules into arrays.
What is dynamic instability?Dynamic instability refers to the constant growth and shrinkage of microtubules at a constant rate.
Dynamic instability is important as it plays an important role in the cell cell cycle.
Dynamic instability helps in the organization of microtubules into arrays which are found throughout the cell cycle.
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what kind of neurotransmitter is serotonin ?
According to the research, serotonin is an inhibitory type neurotransmitter that acts in the brain regulating mood, sleep.
What is serotonin?It is a neurotransmitter that is produced in the intestines, brain and blood platelets from the synthesis of tryptophan.
This neurotransmitter plays a relevant role in the inhibition and regulation of sleep, appetite, body temperature and anger, for example.
Therefore, we can conclude that according to the research, serotonin is an inhibitory type neurotransmitter that acts in the brain regulating mood, sleep.
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After completion of the citric acid cycle, most of the usable energy from the original glucose molecule is in the form of __________.
During isovolumetric phases of the cardiac cycle, a. The atria are contracting and all heart valves are closed. b. All heart valves are closed. c. The ventricles can only be relaxing. d. The atria are contracting. e. Blood is being ejected into the aorta.
During isovolumetric phases of the cardiac cycle, the atria are contracting.
What happen in isovolumetric phases of the cardiac cycle?The isovolumetric contraction occurs in isovolumetric phase that causes left ventricular pressure to rise above atrial pressure. This leads to opening of aortic valve at the end of isovolumetric contraction when left ventricular pressure exceeds aortic pressure.
So we can conclude that during isovolumetric phases of the cardiac cycle, the atria are contracting.
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which is s true for both photosynthesis and cellular respiration
5 things unique to photosynthesis
5 things unique to photosynthesis are:
All living things depend on the organic molecules that are synthesized by plants as a result of photosynthesis.Photosynthesis is not unique to plants. Other organisms are also capable of photosynthesis.Photosynthesis is dependent on the presence of the pigment chlorophyll.In photosynthesis, light energy is converted into chemical bond energy.Photosynthesis occurs in the daytime.What is the co-factor during photosynthesis?The co-factor during photosynthesis is Nicotinamide Adenine Dinucleotide Phosphate.(NADP), and not NAD. The latter is a coenzyme in respiration for ferrying H+(as NADH+) together with FADH+ from Kreb's Cycle into the matrix of mitochondria for oxidative phosphorylation, needed for ATPs synthesis,
Thus, this could be the answer.
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1. The greatest concentration of minerals in Arizona surrounds this city:
O Ajo
Phoenix
Flagstaff
Tucson
Kingman
Answer:
Flagstaff
Explanation:
Got the answer correct
The greatest concentration of minerals in Arizona in found in the city called Flagstaff.
Arizona is one of the most dense and prolific states in the USA for mineral and rock collectors.
It is incredibly diverse in terms of geology.
Minerals like copper, gems, crude perlite, molybdenum, silver, zeolites and more are present here in a very abundant amount.
The best places to collect minerals in Arizona includes area surrounding the cities namely, Flagstaff, Phoenix, Tucson, Clifton, Morristown and Kingsman. But the area with highest concentration those minerals is the near Flagstaff.
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A plant is homozygous for the production of yellow seeds (YY) and homozygous for wrinkled seeds (r). What possible gametes will this plant produce?
OA. Yr only
OB. YY and rr only
OC. Y, y, and r only
OD. YR, Yr, yR, and yr
A plant is homozygous for the production of yellow seeds (YY) and homozygous for wrinkled seeds, possible gametes will this plant produce (r) Y, y, and r only. Thus, option "C" is correct.
How, explain your answer?The plant is heterozygous (Yy) for the color of seed and homozygous (rr) for the shape of the seed.
For the color of the seed, there are two alleles that will take part in gametes formation are (Y) n (y) while for the shape of seed is have only two recessive alleles (r).
So, by the assortment of (Y) n (r) the first gamete will be (Yr) and an assortment of (y) n (r) second gamete will be (yr).
Thus, the correct answer is option C. Yr and yr only.
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how does binary fission differ from multiple fission
Answer:
Here's a couple of things...
Binary fission results in two daughter cells while multiple fission results in numerous daughter cells
Binary fission occurs under favorable condition while multiple fission occurs under unfavorable condition
Binary fission is where the parental body divides once while multiple fission is where the parental body divides repeatedly
Explanation:
Hope this helps you!
Answer:
binary means two multiple many
Explanation:
many cells dividing into many more cells
Crabeater seals eat krill.
Fishermen catch large amounts of krill from the sea.
How would a decrease in the number of krill affect the number of
crabeater seals?
___________________________________________________________________
_____________________________________________
Leopard seals also eat krill.
A decrease in the number of krill will affect the crabeater seals sooner
than it affects leopard seals.
Give the reason for this.
if the number of individuals in the krill decreased, then the crab and crabeater seal populations would decrease because there would not be enough food for all of the individuals of their populations to eat.
Mr. jones science class is comparing three samples. Mr.jones divided his class up into four groups. Each group was given one of each of the samples to measure the mass. What would be the explanation why group 3's measurements were so different from the rest of the groups
It could be that group 3 was given a different sample entirely.
Mass measurementThe class was divided into 4 groups, whereas, only 3 samples were to be weighed and compared.
Thus, it could be that group 3 was given another sample that is entirely different from the other groups.
If group 3 was actually given one of the 3 samples, it means that they made a mistake during weighing.
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Arrange the following items in the correct order
1.
2.
3.
4.
5.
RNA polymerase finds promotor
RNA polymerase adds new nucleotides
RNA polymerase unwinds strand
transcript is released
RNA polymerase reaches termination site
SUBMIT
Answer:
1.) RNA polymerase find promotor
2.) RNA polymerase unwinds strand
3.) RNA polymerase adds new nucleotides
4.) RNA polymerase reaches termination site
5.) Transcript is released
The correct order is 1. RNA polymerase unwinds the strand, 2. RNA polymerase finds promoter, 3. RNA polymerase adds new nucleotides, 4. The transcript is released, 5. RNA polymerase reaches the termination site.
The process of transcription involves the synthesis of RNA from a DNA template.
RNA polymerase unwinds strand: RNA polymerase recognizes the DNA strand that needs to be transcribed and unwinds the double helix, separating the two DNA strands.
RNA polymerase finds promoter: RNA polymerase searches for and binds to a specific DNA sequence called the promoter, which marks the starting point for transcription.
RNA polymerase adds new nucleotides: Once bound to the promoter, RNA polymerase begins moving along the DNA strand, reading the template strand and adding complementary RNA nucleotides. This process is known as elongation.
The transcript is released: As RNA polymerase moves along the DNA template, it continues adding nucleotides to the growing RNA molecule. Eventually, it reaches a termination site on the DNA, signaling the end of the gene or region being transcribed. At this point, the RNA polymerase releases the completed RNA transcript.
RNA polymerase reaches the termination site: The termination site is a specific DNA sequence that signals the end of transcription. Once RNA polymerase reaches this site, it detaches from the DNA template, and the RNA transcript is released.
Thus, the correct order is 1. RNA polymerase unwinds the strand, 2. RNA polymerase finds promoter, 3. RNA polymerase adds new nucleotides, 4. The transcript is released, 5. RNA polymerase reaches the termination site.
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Question 5 of 25
Which of these is an abiotic factor in an aquatic ecosystem?
A. Whales
B. Seaweed
C. Sea stars
D. Water
Answer:
d - water
Explanation:
an abiotic factor in any ecosystem is non living
the only non living thing in this ecosystem that is listed is water
so water is the answer
Answer:
[tex]\huge\boxed{\sf Water}[/tex]
Explanation:
Abiotic factors:The factors of an ecosystem which are non-living are called the abiotic factors of the ecosystem.In the given list:
Whales are living.Seaweed is living.Sea stars are living.Water is non-living.So, Water is an abiotic factor of an aquatic ecosystem.
[tex]\rule[225]{225}{2}[/tex]
Which of the following is NOT one of the 3 major areas of society affected by science?
1. write about the natural resources of ethiopia and why we need to take of them
You are a molecule of phosphorus. Choose a starting point in the phosphorus cycle and describe the process you would go through to move through the entire cycle.
Living creatures and the soil exchange phosphorus. Phosphates are taken up by plants from the soil and assimilated into organic molecules. Plants are consumed by animals, which then moves phosphorous up the food chain from one animal to the next. When an animal perishes and decomposes, phosphorus is released back into the soil.
During which phase of the cell cycle is a cell's DNA copied?
A. R phase
B. Prophase
C. Interphase
M. M phase
Answer:
Interphase
Explanation:
Answer:b
Explanation:because it is the best answer
18. What important cellular process produces water
molecules as it breaks down glucose in the presence of
oxygen?
Answer:
Aerobic cellular respiration
Select the correct answer from each drop-down menu. juan picks up a steel utensil and immediately drops it because it’s extremely hot. how does the reflex arc work to protect juan from a worse burn? in a reflex arc, the neuron carries the action potential from the .
The correct answer will be
1. Motor neuron
2. Spinal cord to muscle
In a Reflex arc, the Motor neuron carries the action potential from the Spinal cord to muscle.
The following are the components of a reflex arc:
A stimulus-detecting receptorA sensory neuron that will transmit the data to the spinal cord.A processing interneuron for the data (not present in all reflexes)A neuron that transmits signals to an effector organAn organ that carries out the reaction action.A brain circuit that manages a reflex is called a reflex arc. In vertebrates, the majority of sensory neurons synapse in the spinal cord rather than passing directly into the brain.
When Juan picks up a steel utensil the receptor detects the stimulus. A sensory neuron transmits the data to motor neuron which activates spinal cord which then signals the effector organ to carry out the reaction action i.e., Juan immediately drops the hot Utensil.
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Answer:
Thus us what you should see got it right on plato!
Explanation:
Based on the number of offspring they produce at one time organisms are classified into two categories many offspring at once and a few at a time sort the characteristics based on the category they describe
Full question:
Drag each label to the correct location on the chart. Based on the number of offsprings they produce at one time, organisms are classified into two categories many offsprings at once and a few at a time. Sort the characteristics based on the category they describe.
A.Low percentage of offspring reach adulthood,
B.limited parental involvement,
C.High percentage of offspring reach adulthood,
D.Rapid maturation,
E.Parental care observed,
few offspring at once vs many offspring at once.
Answer:
At the same time, there are a few offspring
C. A high proportion of offspring grow up to be adults.
E. Observed parental care,
At the same time, many offspring
A. Only a small fraction of offspring grow up to be adults.
B. minimal parental participation;
D. Rapid maturation.
Few offspring at a time have a high percentage of offspring reaching adulthood. If a large percentage of offspring reach adulthood, the offspring are likely to be few and well cared for.
What is parental care?Parental care is seen to be unique to only a few offspring at a time. If the parents provide good care to their children, the offspring are likely to be few. It will be easier for the parent organism to care for a small number of children at once.
Many offspring at once have a low percentage of offspring reaching adulthood. Because there are so many kids at once, competition for room and food, as well as a lack of care, only a small percentage of them will reach adulthood.
Many offspring have limited parental participation at the same time. Because there were so many kids at the same time, the competition for parental care among the offspring would be strong. The parents' organism will be unable to care for the large number of children.
Rapid maturation is unique to several offspring at the same time. In order to survive, the organism will have to mature quickly. Due to the large number of children, survival will be determined by the fittest. The ability of the children to mature quickly will be aided by the survival of the fittest trait.
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What is a hypothesis?
A. an educated explanation for the set of observations
B. an organized way of recording data
C. the results of an experiment
Udens
Answer:
A.
Explanation:
The other options don't make sense.
Answer:
A.) an educated explanation for the set of observations
Explanation:
Hypotheses are testable statements. People then conduct experiments or studies to collect information that either proves or disproves the hypothesis.
Which description best explains how a Doppler radar system works?
O A. It refilects waves off of objects, measuring the difference of the waves it sends and receives.
OB.
It sends out a set of waves where each wave is preprogrammed to detect a certain kind of object.
© C It uses an antenna to measure the angle
two or more oo ects i
distant space
© D.
it uses the Doppler effect to raise trie pitch of sound waves so objects in distant space can be he:
Answer : (A) "It reflects waves off of objects, measuring the difference of the waves it sends and receives".
Explanation :
In Doppler radar system, radio waves emitted from an antenna. It gives information about the motion of targets and their position.
Phase change between a transmitted wave and received echo is calculated using Doppler radar system.
It also gives radial velocity i.e. velocity in the direction of radar. If the phase shift is positive this means the motion is toward the radar and if the phase is negative this implies the motion is away from the radar.
So, the correct option is (A) "It reflects waves off of objects, measuring the difference of the waves it sends and receives".
1. do you think erythropoietin levels in athletes at low altitude are lower, higher, or the same after training at a high altitude for 2 months?
2. calculate the average ml of oxygen molecules in 100 ml blood in the athletes at low altitude and then in athletes in high altitude while training at high altitude. use the following information: 1.39 ml of oxygen per gram of hemoglobin.
3. do athletes training at high altitudes have more or less oxygen molecules per ml of blood then athletes training at low altitudes? explain why this difference gives athletes who train at high altitudes an advantage over athletes who train only at low altitudes.
results
table: effect of altitude on hct and hb
low altitude
hb length of whole length of
blood column packed rbc hematocrit hb
(nm)(g/100 column (mm) % (g/100 blood)
subject 1 52 21 40 14.5
subject 2 49 20 41 14.4
subject 3 48 21 44 14.6
average 4 50 21 42 14.5
high altitude
hb length of whole length of
blood column packed rbc hematocrit hb
(nm)(g/100 column (mm) % (g/100 blood)
subject 1 49 22 45 17.4
subject 2 50 22 44 17.3
subject 3 50 22 44 17.3
subject 4 50 22 44 17.3
1. Erythropoietin will be higher at low altitude. Erythropoietin or EPO level will be higher because of the raised blood oxygen training but its lasting period will depend on the training content as here it is only 2 months.
About high erythropoietin:
Among the objectives of altitude training is to improve athletes' sea-level endurance performance by raising blood oxygen carrying capacity. The attainment of improved haematological variables is mostly due to the augmented erythropoietin (EPO) production in hypoxia. The duration of exposure and degree of hypoxia affect the level of the erythropoietin EPO rise and the rate of erythropoiesis acceleration. The haematological response to altitude training may also be influenced by a wide range of additional factors.
2. 100 ml of blood contain 27.8 mL of oxygen. This can be said as it has been shown that a healthy person typically possesses 20 grammes of haemoglobin in every 100 millilitres of blood.
Procedure:
=20∗1.39
=27.8mL
Amount of oxygen found in 11 grams of hemoglobin is equal to 1.39 milliliters of oxygen.
Thus, the total amount of oxygen in milliliters would be equal to product of total weight of hemoglobin and the total amount of oxygen in ml in one gram of hemoglobin.
3. Athletes training at high altitude have more oxygen molecules. They have an advantage as a result of having more red blood
Why so:
Higher elevations have thinner air, which has less oxygen molecules per volume of air. The body therefore makes more red blood cells when athletes workout at these high elevations. For up to 20 days, these additional blood cells remain in the body. Also as a result of having more red blood cells, their blood can carry more oxygen. When they compete at lower elevations, their muscles naturally get a boost from more oxygen.
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During an action potential, the rapid decrease in sodium permeability and simultaneous increase in potassium permeability is responsible for __________.
During an action potential, the rapid decrease in sodium permeability and simultaneous increase in potassium permeability is responsible for Repolarization.
K+ departs the cell after Na+, which enters the cell first. Ions can move freely across the axon membrane because of the difference during the action potential.Because sodium contains a positive charge, the neuron becomes more positive and depolarized. Potassium channels take longer to open. As soon as the cell does open, K+ rushes out, reversing the depolarization known as repolarization.Sodium channels close during the peak of the action potential when potassium leaves the cell. When potassium ions are effluxed, the membrane potential is lowered or the cell becomes hyperpolarized.Outside of the cell, the concentration of Na+ is greater than inside the cell. while the concentration of K+ is is greater inside the cell than outside.
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What is data ?
A. a numerical value to represent how accurate
the recordings of an experiment are
B. detailed recordings of experimental
observations
Umak
C. only non-numerical observation from an
experiment
Answer:
B
Explanation:
The definition for 'Data' is facts and statistics collected together for reference or analysis.
So I would answer B as this seems the most appropriate
The data is the detailed recordings of experimental observations. The correct option is B.
What is experimental observations?Because of the physical insight they provide to the scientist in formulating the theory, experimental observations and measurements are widely accepted to be the backbone of physical sciences and engineering.
Observational studies are those in which researchers examine the impact of a risk factor, diagnostic test, treatment, or other intervention without attempting to change who is or is not exposed to it.
Observational studies are classified into two types: cohort studies and case control studies.
Experiments or surveys are used to collect data for statistical studies. The branch of statistics that deals with the design and analysis of experiments is known as experimental design.
Thus, the correct option is B.
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