ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of these is an adaptation alveoli have for efficient gas exchange?
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thick walls
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thin walls
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small surface area
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Explanation:
Detailed explanation-1: -Moist walls-gases dissolve in the moisture helping them to pass across the gas exchange surface.
Detailed explanation-2: -Efficient gas exchange systems must: have a large surface area to volume ratio • be thin • have mechanisms for maintaining steep concentration gradients across themselves • be permeable to gases.
Detailed explanation-3: -Each alveolus is cup-shaped with very thin walls. It’s surrounded by networks of blood vessels called capillaries that also have thin walls. The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood.
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