Multiple choice

What happens to the diaphragm at the time of inspiration?

  1. expands

  2. contracts

  3. Relaxes

  4. Remains unchanged
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During inspiration (inhalation), the diaphragm contracts and flattens, increasing the volume of the thoracic cavity. This creates negative pressure that draws air into the lungs. During expiration, the diaphragm relaxes and returns to its dome shape. Option A is vague (expands is not the precise term - contracts/flatten is more accurate).

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