EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which part of the human respiratory system is a thin, moist membranous structure where gas exchange occurs?
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trachea
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bronchus
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epiglottis
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alveolus
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Explanation:
Detailed explanation-1: -The acinus is the structure in the lung where gas exchange occurs. The sac-like structure of the alveoli increases their surface area. In addition, the alveoli are made of thin-walled parenchymal cells. These features allow gases to easily diffuse across the cells.
Detailed explanation-2: -The function of the respiratory system is to move two gases: oxygen and carbon dioxide. Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them.
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