Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

During exercise, the oxygen consumption ( V O 2 ) of the skeletal muscles may account for more than

A. 65 percent of the total V O 2

B. 75 percent of the total V O 2

C. 85 percent of the total V O 2

D. 95 percent of the total V O 2

Summary Introduction


The total oxygen consumption during exercise increases as more oxygen is required by muscles. Most of the total oxygen consumed is used by skeletal muscles as they control the voluntary and involuntary functions. They also require energy for movement, which is generated with the help of oxygen.


Explanation for the correct answer:

Option (D) states that more than 95% of the VO2 is consumed by the skeletal muscles during exercise. The alveolar ventilation, oxygen diffusion capacity, blood flow in muscles, and consumption of oxygen increases during heavy exercise. The oxygen consumption of skeletal muscles increases by increasing the blood flow to the skeletal muscles. This happens because of an increased cardiac output, metabolic vasodilatation in the active muscles, and the blood from viscera and skin diverts to the muscles. This provides more energy. Hence, option (d) is the correct answer

Explanation for the incorrect answer:

Option (A) states that skeletal muscles consume more than 65% of the total VO2 during exercise. The total oxygen consumed is used in providing them energy to perform the basic voluntary and involuntary functions

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