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Question

Which of the following events take place during inhalation?

A
Diaphragm moves down.
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B
The volume of chest cavity increases, pressure in lungs decreases.
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C
Diaphragm moves up.
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D
The volume of chest cavity increases, pressure in lungs increases.
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Solution

The correct option is D The volume of chest cavity increases, pressure in lungs increases.
During inhalation, the diaphragm moves downward causing the chest cavity to increase in size. The same amount of air now occupies a larger space, causing the pressure inside the lungs to decrease. This results in the air rushing in through the nostrils into the lungs.

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