How does the volume in the lungs change as we breathe?

As humans breathe in, the ribcage moves upwards and outwards. As this happens, the diaphragm flattens and moves down. This allows air to move into the lungs causing an increase in volume within the lungs. Then when we breathe out, the ribcage moves back down and the diaphragm moves out causing a decrease in volume.

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Answered by Rebecca W. Biology tutor

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