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How does your diaphragm breathing and ribs change the volume of the lungs?

1 doctor weighed in
Dr. Asaf Presente
Internal Medicine - Pulmonary Critical Care

In brief: 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.

In brief: 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.
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Dr. Aaron Milstone
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