Question

why does th e heart automatically adjust the flow to match activity levels? A. Extreme actvity damages blood cellsand the body needs replacements B. the heart requires more oxygen when excersing C.it builds upahigher level of oxyge int he blood D.organs and musclesrequire moreblood under stress

Answer 1

Hey,

Why does th e heart automatically adjust the flow to match activity levels?

B. The heart requires more oxygen when exercising.

Step-by-step explanation:

When you exercise your heart has to work harder and beats faster to pump blood throughout your blood vessels. Blood movement retains the body and its organs operating accurately.