Read the below statements about the human digestive system: 1. Bile emulsifies fats but does not contain enzymes. 2. Trypsinogen is activated to trypsin in the stomach. 3. Villi in small intestine increase surface area for absorption. Which of the above statements are correct?
Only 1 and 3 are correct
Statement 1 is correct: bile, made by the liver and stored in the gall bladder, contains bile salts that break large fat globules into tiny droplets (emulsification). It contains no digestive enzymes.
Statement 2 is incorrect: trypsinogen is secreted by the pancreas and is activated to trypsin in the small intestine (duodenum) by the enzyme enterokinase (enteropeptidase), not in the stomach.
Statement 3 is correct: villi (and the microvilli on them) are finger-like projections of the small intestine lining that greatly increase the surface area for absorbing digested food.
Hence, only statements 1 and 3 are correct.
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