Practice Quiz

ACSM Personal Trainer

Category - Exercise Programming and Implementation

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During exercise, a modification of the cardiovascular system involves the redirection of blood from organ systems to skeletal muscles. What percentage of blood flow normally goes toward muscles and to what percent does this increase during exercise?
  1. Normal 10%, exercise elevates to 75%
  2. Normal 15%, exercise elevates to 85%
  3. Normal 20%, exercise elevates to 85%
  4. Normal 25%, exercise elevates to 90%
Explanation
Answer: C - At rest, the normal percentage of blood flow going to skeletal muscles is about 20%, which becomes elevated to about 85% during exercise. This cardiovascular modification is to accommodate the increased demand for oxygen during physical activity, thus blood becomes redirected from the organ systems to the skeletal muscles.
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