HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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small surface area
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thin
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good blood supply
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large surface area
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Detailed explanation-1: -Final answer: The incorrect statement is “They maintain the shape and surface tension of the air sac”
Detailed explanation-2: -They are thin, squamous, and flat epithelial lining cells that form the structure of the alveoli. They have long cytoplasmic extensions that cover beyond 95% of the alveolar surface. The thin lining enables a fast diffusion of gas exchange between the air in the alveoli and the blood in the surrounding capillaries.
Detailed explanation-3: -The alveoli are surrounded by tiny blood vessels, called capillaries. The alveoli and capillaries both have very thin walls, which allow the oxygen to pass from the alveoli to the blood. The capillaries then connect to larger blood vessels, called veins, which bring the oxygenated blood from the lungs to the heart.