Discuss the mechanism of breathing.

Expert Solution

Breathing is a process that involves inhalation or inspiration and exhalation or expiration.
Inspiration is the drawing in of air while expiration is the release of air.
Inspiration:
- When the external intercostal muscles found between the ribs contract, the ribs move upwards and outwards.
- The diaphragm also contracts and flattens.
- This increases the thoracic volume.
- The intra-pulmonary pressure decreases and becomes less than the atmospheric pressure.
- Since gases move from their region of higher pressure to their region of lower pressure, the air rushes into the lungs.
Expiration:
- When the external intercostal muscles relax, the ribs move inwards and downwards.
- The diaphragm relaxes and becomes dome shaped.
- This reduces the thoracic volume.
- The intra-pulmonary pressure increases and becomes more than the atmospheric pressure.
- Since gases move from their region of higher pressure to their region of lower pressure, the air rushes out of the lungs.

Sydney Mullin answered 1 year ago

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