Which one of the following statements is true about the digestion and absorption of food in humans?

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Pepsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa.

Chylomicrons are transported into the lacteals of the intestinal villi.

About 30 per cent of starch is hydrolysed by pancreatic amylase.

Pepsin digests proteins into amino acids.

answer is D.

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Detailed Solution

Fatty acids and glycerol being insoluble, cannot be absorbed into the blood. They are first incorporated into small droplets called micelles which move into the intestinal mucosa. They are re-formed into very small protein coated fat globules called the chylomicrons which are transported into the lymph vessels (lacteals) in the villi. These lymph vessels ultimately release the absorbed substances into the blood stream.

About 30 per cent of starch is hydrolysed by salivary amylase.

Trypsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa.

Pepsin digests proteins into proteoses and peptones.

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