Nan,age 70,feels More Out of Breath While Exercising

question 16

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.

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The amount of money owed by a patient for health care services received.

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