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Why does the heart automatically adjust the flow of blood to match activity levels?
a. extreme activity damages blood cells and the body needs replacements.
b. the heart requires more oxygen when exercising.
c. it builds up a higher level of oxygen in the blood.
d. organs and muscles require more blood under stress.

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Answer:

D. organs and muscles require more blood under stress.

Explanation:

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The heart automatically adjusts the blood flow because organs and muscles require more blood under stress.

The flow of blood to match activity levels.

When the organism is asked to generate energy, the effector organs of movement, the muscles, receive a proportionately greater volume of blood ejected by the heart.

The heart logically increases its work and receives more blood itself.

With this information, we can conclude that the heart pumps more blood to supply the demand of the organs.

Learn more about Heart in https://brainly.com/question/16566688

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