Lung Volume: Sitting up pulls your abdominal contents away from the diaphragm and allows more room for the diaphragm to come down with each breath.
Answered 7/5/2018
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See below: When you are supine, prone or bending, the contents of the abdominal cavity press on the diaphragm and the lungs and prevent their full expansion.
Answered 12/2/2022
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