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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.
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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 reduces the level of oxygen in the blood.
D. Organs and muscles require more blood under stress.

User Branden Huggins
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2 Answers

13 votes
The answer to your question is D
User Katucha
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11 votes

Answer:

C

Step-by-step explanation:

it builds up higher level of oxygen in the bloof

User Edwgiz
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