During inspiration, the diaphragm primarily does which action?

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Prepare for the NREMT Advanced-EMT Test. Use flashcards and multiple choice questions, complete with hints and explanations. Ready yourself for success on your exam!

Multiple Choice

During inspiration, the diaphragm primarily does which action?

Explanation:
The diaphragm contracts. When it contracts, it moves downward and flattens, increasing the vertical dimension of the thoracic cavity. This expansion of the chest volume lowers intrapulmonary pressure below atmospheric pressure, drawing air into the lungs. The diaphragm relaxes during expiration, allowing elastic recoil to push air out. Other terms like expanding or stretching don’t describe the diaphragmatic action during inspiration, and relaxing is associated with expiration rather than inspiration.

The diaphragm contracts. When it contracts, it moves downward and flattens, increasing the vertical dimension of the thoracic cavity. This expansion of the chest volume lowers intrapulmonary pressure below atmospheric pressure, drawing air into the lungs. The diaphragm relaxes during expiration, allowing elastic recoil to push air out. Other terms like expanding or stretching don’t describe the diaphragmatic action during inspiration, and relaxing is associated with expiration rather than inspiration.

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