When the scapula is fixed, what action does the serratus anterior perform?

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Multiple Choice

When the scapula is fixed, what action does the serratus anterior perform?

Explanation:
When the scapula is fixed, the serratus anterior acts on the ribs to help expand the chest rather than move the scapula. Its fibers pull on the upper ribs, elevating the rib cage and increasing thoracic volume to assist forced inhalation. That is why elevating the thorax during forced inhalation is the best description of its action in this scenario. The other actions involve moving the scapula itself, which isn’t happening when the scapula is fixed.

When the scapula is fixed, the serratus anterior acts on the ribs to help expand the chest rather than move the scapula. Its fibers pull on the upper ribs, elevating the rib cage and increasing thoracic volume to assist forced inhalation. That is why elevating the thorax during forced inhalation is the best description of its action in this scenario. The other actions involve moving the scapula itself, which isn’t happening when the scapula is fixed.

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