Question: Describe the mechanism of inhalation in humans?
Inhalation in humans is a vital process that involves the expansion of the lungs, which is facilitated by the contraction of the diaphragm and the intercostal muscles. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity. Simultaneously, the intercostal muscles contract, lifting the rib cage and further expanding the chest. This expansion creates a negative pressure within the lungs compared to the atmospheric pressure outside, causing air to flow into the lungs. The air travels through the respiratory tract, down the trachea, and into the bronchi and bronchioles, finally reaching the alveoli where gas exchange occurs. This mechanism follows Boyle's Law, which states that pressure and volume have an inverse relationship within a closed system.
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