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Which statement regarding respiration is TRUE?

A. Inspiration increases intra-pulmonary pressure.
B. The diaphragm is dome-shaped during inspiration.
C. Intrapleural pressure is always higher than atmospheric pressure.
D. Increased thoracic volume decreases intra-pulmonary pressure.
E. Thoracic volume increases with expiration.


Sagot :

Final answer:

Intrapulmonary pressure is always greater than intrapleural pressure. Inspiration decreases intra-pulmonary pressure, allowing air to enter the lungs, while expiration increases this pressure, causing air to leave the lungs.


Explanation:

Intrapulmonary pressure is always greater than intrapleural pressure. During inspiration, the diaphragm contracts, increasing thoracic volume and decreasing intra-pulmonary pressure, allowing air to enter the lungs. Expiration is a passive process where the diaphragm and intercostal muscles relax, leading to a decrease in thoracic volume and an increase in intra-pulmonary pressure, causing air to leave the lungs.


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