On a flow-volume loop, which axis represents flow?

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Multiple Choice

On a flow-volume loop, which axis represents flow?

Explanation:
Flow is the rate of air movement during breathing, and on a flow-volume loop it’s shown on the vertical axis. The horizontal axis represents the cumulative volume moved, not time, so the graph traces how air moves in and out as volume changes. Expiratory flow is plotted upward (positive) and inspiratory flow downward (negative), giving the characteristic loop. Time isn’t plotted as a separate axis in this diagram, and the diagonal or time axes don’t represent flow in the standard flow-volume loop.

Flow is the rate of air movement during breathing, and on a flow-volume loop it’s shown on the vertical axis. The horizontal axis represents the cumulative volume moved, not time, so the graph traces how air moves in and out as volume changes. Expiratory flow is plotted upward (positive) and inspiratory flow downward (negative), giving the characteristic loop. Time isn’t plotted as a separate axis in this diagram, and the diagonal or time axes don’t represent flow in the standard flow-volume loop.

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