Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

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

At the onset of exercise, sympathetic discharge causes the

1. Heart rate to decrease

2. Peripheral vascular system to constrict

3. Heart to increase its strength of contraction

4. Blood vessels of the working muscles to dilate

A. 3 only

B. 2 and 4 only

C. 1 and 2 only

D. 2, 3, and 4 only

Summary Introduction


The components of the cardiopulmonary system may get stressed to their limits, during heavy exercise. The increased cardiac output decides the duration and intensity of the exercise. The circulatory system and muscles are equally important in setting up the limits for the exercise. There are some physiological changes that occur in response to the heavy exercise, in order to supply enough amount of blood to the muscles.


Explanation for the correct answer:

Option (d) is given as 2, 3, and 4 only. A sympathetic discharge is triggered by the medulla oblongata on the signal of the brain, with the onset of exercise. There are two circulatory effects on the sympathetic discharge, one is an increase of heart rate and contraction strength, and the second is the constriction of the peripheral vascular system. The dilation of the blood vessels also occurs to increase the blood supply to the active muscles. Hence, option (d) is the correct answer.

Explanation for the incorrect answer:

Option (a) is given as 3 only. It is stated that the contraction strength of the heart is increased but dilation of blood vessels of working muscles and constriction of the peripheral vascular system also occur...

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