- Inhalation is the process of breathing in air(oxygen).
- The external intercostal muscles contracts.
- The internal intercostal muscles relaxes
- The diaphragm muscles contracts and flattens.
- The ribs moves outwards and upwards.
- Since the external intercostal muscle are thicker than internal intercostal muscles, volume within the thoracic cavity increases as compared to the lungs.
- As a result the atmospheric pressure increases while the pressure within the lungs decreases.
- Consequently, air is drawn into the lungs through the nose down a pressure gradient.
franco crick answered the question on January 22, 2018 at 16:14
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