Explain the mechanism of inhalation in humans.
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Mechanics of Breathing. The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. This action is also known as external respiration. When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity.
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When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity. ... When we exhale the diaphragm and intercostal muscles relax and return to their resting positions. This reduces the size of the thoracic cavity, thereby increasing the pressure and forcing air out of the lungs.
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