Absorption in the Small Intestine Flashcards

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What role do enzymes play in digestion?

Enzymes break down large food molecules into smaller molecules that can be absorbed into the bloodstream.

Where does most digestion and nutrient absorption occur?

Most digestion and nutrient absorption occur in the small intestine.

What are villi and why are they important?

Villi are finger-like structures on the inner wall of the small intestine that increase the surface area for absorption of digested food molecules.

How does the small intestine ensure a fast absorption rate of nutrients?

The small intestine has a thin wall, millions of villi, and a network of capillaries, which all help increase the surface area and provide a good blood supply for fast absorption.

What is the function of the capillaries in the villi?

Capillaries in the villi carry away the products of digestion, maintaining a concentration gradient and increasing the rate of diffusion across the intestinal wall.

What is egestion and how is it different from excretion?

Egestion is the process of expelling undigested waste (faeces) from the body through the anus, while excretion is the removal of metabolic waste products from the body.

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