Multiple Choice
Nan,age 70,feels more out of breath while exercising.This is probably because
A) the blood flow to her circulatory system has increased.
B) her heart muscle is more responsive to signals from pacemaker cells.
C) her vital capacity has reduced significantly due to aging.
D) her T cells are becoming more effective and efficient.
Correct Answer:
Verified
Correct Answer:
Verified
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