When the diaphragm contracts, it
A) becomes flatter.
B) opens a hole in its center through which air flows.
C) becomes more dome-shaped.
D) aids in expiration.

Name: When the diaphragm contracts, it A) becomes flatter. B) opens a hole in its center through which air flows. C) becomes more dome-shaped. D) aids in expiration.
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Question

Quizplus · Accepted Answer

When the diaphragm contracts, it moves downward and becomes flatter, increasing the volume of the thoracic cavity and aiding in inspiration.

When the Diaphragm Contracts, It