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, heat production may increase as much as

A. 10-fold

B. 20-fold

C. 30-fold

D. 40-fold

Summary Introduction


A large amount of oxygen is required by the body cells and tissues during intense exercise. The cardiovascular system functions harder and it causes an increase in the stroke volume and cardiac output. Body heat is also generated tremendously for optimum regulation of body temperature.


Explanation for the correct answer:

Option (b) is given as 20-fold. The alveolar ventilation, oxygen diffusion capacity, blood flow in muscles, consumption of oxygen and production of heat increases during intense exercise.

Heat dissipation from the body is a way of cooling the body on its own. This is carried out by metabolic reactions. The heat dissipated by the body through the skin may increase upto 20-fold. This is ensured by increasing the flow of blood to the body surface. Hence, option (b) is the correct answer.

Explanation for the incorrect answer:

Option (a) is given as 10-fold. The heat production increases by 20-fold. This heat leads to the dilation of muscles and a higher blood flow is ensured to the skin...

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