When breathing in, or inhaling, the diaphragm contracts, or tightens. When exhaling, or breathing out, the diaphragm expands, or loosens.
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During exhalation, the diaphragm relaxes and moves back up towards the chest cavity, which increases the pressure in the lungs. This increase in pressure forces air out of the lungs through the airways.
Exhaling is expelling used air from the lungs. During exhalation,the diaphragm moves upward while the rib cage moves downward so it goes back to its dome-shaped position
Exhalation at rest is primarily driven by passive forces, such as elastic recoil of the lungs and chest wall. During exhalation, the diaphragm and external intercostal muscles relax, allowing the lungs and chest wall to return to their resting position, pushing air out of the lungs.
During exhalation at rest, the principal driving force is passive elastic recoil of the lungs and chest wall. As the diaphragm relaxes and the external intercostal muscles relax, the lungs passively recoil to their resting size, which pushes air out of the lungs. This process does not require active muscle contraction.
Air moves into and out of a person's lungs through the process of inhalation and exhalation. During inhalation, the diaphragm and chest muscles contract, creating a vacuum that draws air into the lungs. During exhalation, the diaphragm and chest muscles relax, allowing air to be pushed out of the lungs.
Changing the volume of the chest cavity, and therefore inspiration and expiration.The function of the diaphragm is to inflate and deflate the lungs for gaseous exchange.