33. Which of the following pertains to what happens when the diaphragm, external

Question

33. Which of the following pertains to what happens when the diaphragm, external intercostal, scalene, pectoralis minor, serratus anterior and sternocleidomastoid muscles contract? a. This occurs during forced inhalation. VC would measure the total amount of air b. This occurs during forced inhalation. The sum of TV and IRV would measure the total c. This occurs during forced exhalation. ERV would measure the amount of air forcefully d. This occurs during forced exhalation. VC would measure the amount of air forcefuly inspired. amount of air inspired. expired. expired

Explanation / Answer

All these muscles contract during inhalation.

So statement a is correct.

B) so this will occur during forced inhalation. The sum of TV and IRV would measure the total amount of air inspired.

Inspiratory reserve volume (IRV) is the amount of air that can be taken in “on top of” the tidal volume, with a deep breath. This ranges from 2,100 to 3,200 ml. The reverse of the IRV is the expiratory reserve volume (ERV), the amount of air that can be forcefully expelled after the tidal volume.

Vital capacity measures the total amount of air inspired.

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