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goldfiish [28.3K]
3 years ago
6

During exercise, cardiac output may increase by more than 170% to meet the body’s increased O₂ demands. This increase in cardiac

output increases blood pressure. But the accompanying increase in arterial pressure is relatively small—only about 40%. What limits this increase in blood pressure so that it doesn’t reach dangerously high levels during exercise?a. Blood vessels shorten in the contracting skeletal muscles.b. Blood volume decreases due to sweating.c. Vasodilation causes arterial diameter to increase in the exercising skeletal muscle.d. Hematocrit decreases as more interstitial fluid enters the blood vessels.
Biology
1 answer:
viva [34]3 years ago
7 0

Answer:

c. Vasodilation causes arterial diameter to increase in the exercising skeletal muscle

Explanation:

Cardiac output increases blood pressure due to increased pumping action of the heart. To protect the blood pressure to rise to the fatal levels during exercise or any other activity of excessive muscle contraction, blood vessels are stimulated to dilate.

Dilation of arteries dissipates some of the blood pressure. The arteries with larger diameter have less blood pressure than the arteries with a narrow cavity under the conditions of the same cardiac output. Therefore, the dilation of arteries Dilation does not allow the blood pressure to rise to the harmful levels.

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Complete question:

Thinking creatively about evolutionary mechanisms, identify at least

two schemes that could generate allelic polymorphism in a population except natural selection that favors heterozygotes.

<u>Select the two correct answers.</u>

-inbreeding among individuals in the population

-purifying selection against mutational variants of alleles in the population

-continuous migration of individuals with new alleles into the population

-mutations that do not severely affect viability and reproductivity

-genetic drift of alleles common in the population

-events leading to genetic bottleneck effect

Answer:

The two events that might favor heterozygotes among the options are  

  • The Continuous migration of individuals with new alleles into the population
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Due to technical problems, you will find the complete explanation in the attached files.

Download pdf
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