Is the contraction of the diaphragm inspiration or expiration?

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Prepare for the VetSkill Level 3 Diploma VN02 – Diagnostic Principles Test. Engage with multiple-choice questions, hints, and explanations. Achieve your certification!

Multiple Choice

Is the contraction of the diaphragm inspiration or expiration?

Explanation:
When the diaphragm contracts, it moves downward, increasing the vertical dimension of the thoracic cavity and thus enlarging the overall thoracic space. This expansion lowers intrathoracic pressure, allowing air to flow into the lungs—so this action is inspiration. Expiration occurs mainly when the diaphragm relaxes, reducing the cavity’s volume and pushing air out. Therefore, contraction that enlarges the cavity best fits inspiration. The other ideas conflict with how volume changes drive airflow: expanding the cavity isn’t what happens during expiration, and contraction that reduces the cavity wouldn’t be inspiration.

When the diaphragm contracts, it moves downward, increasing the vertical dimension of the thoracic cavity and thus enlarging the overall thoracic space. This expansion lowers intrathoracic pressure, allowing air to flow into the lungs—so this action is inspiration. Expiration occurs mainly when the diaphragm relaxes, reducing the cavity’s volume and pushing air out. Therefore, contraction that enlarges the cavity best fits inspiration. The other ideas conflict with how volume changes drive airflow: expanding the cavity isn’t what happens during expiration, and contraction that reduces the cavity wouldn’t be inspiration.

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