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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The maximum alveolar ventilation generated during heavy exercise under normal conditions is about what percent of the maximum voluntary ventilation?

A. 20-35 percent

B. 30-45 percent

C. 40-55 percent

D. 50-65 percent

Summary Introduction

Introduction:

The requirement of oxygen is higher during heavy exercise for the proper functioning of cells and tissues in the body. The blood pressure increases due to heavy exercise, which provides strength to muscles. This also helps in the improvement of the pumping ability of the heart. The breathing pattern follows a curve that has three stages: showing a gradual increase, then slow and finally stabilization of alveolar ventilation, respectively.

Explanation

Explanation for the correct answer:

Option (d) is given as 50–65 percent. The maximum alveolar ventilation is 50–65 percent of the maximum voluntary ventilation. The maximum voluntary ventilation is also called the maximum breathing capacity. This acts as a beneficial factor for athletes and also when an individual is exercising at extreme temperatures or conditions. It is the heart’s inability that serves as a limiting factor, as it is insufficient to pump the blood to muscles working during the exercise. Hence, option (d) is the correct answer.

Explanation for the incorrect answer:

Option (a) is given as 20–35 percent. The maximum alveolar ventilation generated in normal conditions during heavy exercise is 50–65 percent of the maximum voluntary ventilation...

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