The major factor that determines the movement of air into or out of the lungs is a pressure gradient.

Question

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The movement of air into or out of the lungs is determined by a pressure gradient. When the pressure inside the lungs is less than the pressure outside them, air moves in. When the pressure inside the lungs is greater than the pressure outside them, air moves out. This pressure gradient is created by changes in the volume of the lungs, which is controlled by the activity of the respiratory muscles.

The Major Factor That Determines the Movement of Air into or Out