HUMAN PHYSIOLOGY
DIGESTION AND ABSORPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are the structural adaptations of villi for absorption?
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The small intestine is very long that more time is provided for absorption of digested food.
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Microvilli are present on cell surfaces of epithelial cells to further increase surface area for absorption of digested food.
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The epithelial cell is one cell thick to shorten the diffusion distance of digested food.
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The epithelium is one cell thick to shorten the diffusion distance of digested food.
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Explanation:
Detailed explanation-1: -Adaptations of Villi Villi have a wall only one cell thick so the nutrients only have a short distance to diffuse into the blood. Villi have capillaries inside them for a good blood supply to allow for quick diffusion into the blood. Villi have a large surface area to allow quicker diffusion.
Detailed explanation-2: -The large number of villi give the internal intestinal wall a velvety appearance. Each villus has a central core composed of one artery and one vein, a strand of muscle, a centrally located lymphatic capillary (lacteal), and connective tissue that adds support to the structures.
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