Why does the heart automatically adjust the flow of blood to match activity levels?
a.
...
Health, 06.10.2019 22:40 sleepyflower10
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.
Answers: 1
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