When a person is in a supine position, the force of gravity causes ventilation and perfusion to be less at the base of the lungs than at the apex.

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Quizplus · Accepted Answer

In a supine position, gravity causes blood flow (perfusion) to be more evenly distributed, but the base of the lungs receives more perfusion compared to the apex. Ventilation is also more evenly distributed, but due to the shape and weight of the lungs, the base may still receive slightly better ventilation than in an upright position, contradicting the statement.

When a Person Is in a Supine Position, the Force