state the three ways that the surface area of the small intestine is increased.
Question
State the three ways that the surface area of the small intestine is increased.
Solution
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Villi: The inner wall of the small intestine is not flat but covered in millions of tiny finger-like projections called villi. These increase the surface area of the intestine, allowing for more absorption of nutrients.
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Microvilli: Each cell on the surface of a villus has even tinier projections called microvilli. These further increase the surface area for absorption.
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Circular Folds: The inner surface of the small intestine has circular folds, also known as plicae circulares. These folds slow down the passage of food, allowing more time for nutrients to be absorbed, and also increase the surface area.
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