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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. B. The heart requires more oxygen when exercising.
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24 votes
24 votes
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.
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 Jaydeep Patel
by
2.8k points

2 Answers

11 votes
11 votes

Answer:

D. Organs and muscles require more blood under stress.. just took test

User Rodolfo Carvalho
by
2.6k points
21 votes
21 votes

Answer:

d the awnser is just d

Step-by-step explanation:

User Arvind Katte
by
2.9k points
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