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A member asked:
How does your diaphragm breathing and ribs change the volume of the lungs?
A doctor has provided 1 answer
Changes volumes: Human lungs breathe via negative pressure - the diaphragm and if needed the accessory muscles of respiration (intercostal rib muscles, scalenes etc) deform to increase the intrathoracic volume - the lungs expand and you take a breath. Passively relaxing these muscles allow exhalation. You can also force your breath out actively but this is not normally necessary.
Answered 9/28/2016
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