The arterioles (small arteries) leading to an organ, constrict in order to decrease flow to the organ. To shut down an organ, blood flow is reduced naturally to 2.80% of its original value. By what factor did the radii of the arterioles constrict? Penguins do this when they stand on ice to reduce the blood flow to their feet.
Answers
The final radii of the arteriole is reduced by the factor of 0.409 after the constriction of the arteriole.
The flow rate is defined as the amount of fluid flow through the artery in the given time period at the cross-sectional area.
Computation for the radii of constricted arterioles
The flow rate for the artery is given by:
Where, P is the pressure, r is the radius, is the viscosity, and l is the length.
The value of flow rate is reduced to 2.80 % of its natural values. The reduced flow rate is given as:
The ratio of the flow rate is given as:
The final radii of the arteriole is reduced by the factor of 0.409 after the constriction of the arteriole.
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Answer:
The main factor that causes vasoconstriction is the high concentration calcium inside muscle cells.
Explanation:
When the vessels suffer vasoconstriction, the blood supply is decreased and in this way the heat of the body is maintained. The way this happens is because the blood can no longer reach the surface and therefore decreases outward heat radiation. The main factor that causes vasoconstriction is the high concentration calcium inside muscle cells. There are several factors that cause vasoconstriction, internal or external. Environment is one of the external factors, and what happens to the penguins' feet is an example for it, since they are trying to preserve body heat to survive.
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Explain two things we can learn from fossils.
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An experimental pharmaceutical is typically approved after it passes 4 phase of clinical trials.
What is clinical trial ?
Clinical trials are combination of new research, studies and experiments performed in people to evaluate the effectiveness of new experiment on human health.
It consists of main 4 phases.
Phase 4 clinical trial is also known as " Post-Approval Research and Monitoring ". It is the final stage of trial for any pharmaceutical product, drug or device. This trial study about the side effects, real life scenarios, long-term risks and benefits of particular pharmaceutical product which were not seen in the early trials.
So we can sayan experimental pharmaceutical can be approved when it passes 4 phases of clinical trials.
To know more about phases of clinical trial please click here : brainly.com/question/3429518?utm_source=android&utm_medium=share&utm_campaign=question
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Answer:
one is bigger one is smaller
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Answer:
They have contributed same allele for straight hair.
Explanation:
There are two conditions homozygous and heterozygous. In homozygous conditions both the allele of a particular gene is same in an offspring which means the offspring got two same alleles from its parent for a particular gene and if an offspring is heterozygous for a gene that suggests that the parent has contributed two different alleles for that gene in the offspring.
So If Micah is homozygous for straight hair then it can be concluded that his parents have contributed two same alleles for straight hair genes.
Final answer:
If Micah is homozygous for the straight hair gene, both of his parents must have contributed an allele for straight hair. They could be homozygous or heterozygous for this trait.
Explanation:
If Micah is homozygous for the gene that determines straight hair, it means he has two of the same type of allele for that gene - in this case, the allele for straight hair. This indicates that both of his parents must have contributed an allele for straight hair. The simplest scenario is that both of his parents are also homozygous for the straight hair allele. However, it's also possible that one or both parents are heterozygous, possessing one straight hair allele and one potentially recessive curly hair allele. In this scenario, they would have each passed the straight hair allele to Micah.
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that apply)?
Select one or more:
a. warm, moist summers and cold, dry winters
b. Dominance by grasses
c. High soil fertility
d. long, severe winters
e. evergreen vegetation
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b. secrete hormones directly into the bloodstream.
c. are instrumental in producing myelin, which protects the neurons.
d. secrete neurotransmitters into the brain.
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Answer:
B.secrete hormones directly into the bloodstream