Biology B3 1.7 Exchange in the gut.

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What are the villi?
The villi are an efficient exchange surface for the absorption of the soluble products of digestion by diffusion or active transport.
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How is the villi an efficient exchange surface?
Large surface area and good blood supply.
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What happens in the small intestine?
The food we eat is digested in the gut into small, soluble molecules, these solutes are then absorbed into the blood in the small intestine.
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What lines the small intestine?
The villi line the inner surface of the small intestine and are the exchange surface for food molecules.
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What is the appearance of the villi?
The villi are finger-like projections.
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What purpose do the villi shape serve?
They increase the surface area for absorption to take place.
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What is the structure of the walls of the villi?
The walls of the villi are very thin and there are many capillaries close to the wall.
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How are the soluble products of digestion absorbed into the villi?
By either diffusion or active transport.
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**MAXIMUM MARKS -**
**ALWAYS RELATE THE FEATURES OF AN EXCHANGE SURFACE TO ITS FUNCTION, THE TWO KEY EXAMPLES TO LEARN ARE ALVEOLI (IN THE LUNGS) AND VILLI (IN THE SMALL INTESTINE).
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Card 2

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How is the villi an efficient exchange surface?

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Large surface area and good blood supply.

Card 3

Front

What happens in the small intestine?

Back

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Card 4

Front

What lines the small intestine?

Back

Preview of the front of card 4

Card 5

Front

What is the appearance of the villi?

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