Amino acids absorption into enterocytes

The most obvious role of the small intestine is the digestion of nutrients such as carbohydrates, lipids, and proteins into molecules that are small enough to be absorbed (sugars, fatty acids, glycerol, and amino acids). Nutrient absorption by the enterocytes of the small intestine is an extremely vital and complicated process that involves numerous enzymes and transport mechanisms. As described, (p. 374) enterocytes then transport these molecules (and water, minerals, vitamins, and other substances) into the blood and lymph, which carry them throughout the body. 

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