Answered

Why does the heart automatically adjust the flow of blood to match activity levels?

Aextreme activity damages blood cells and the body needs replacements.
Bthe heart requires more oxygen when exercising.
Cit builds up a higher level of oxygen in the blood.
Dorgans and muscles require more blood under stress.

Verified Answer :

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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.

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