Question

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what is the function of villi in the jejunum?
increasing surface area for absorption
regulating water balance
secreting digestive enzymes
helping with mechanical digestion
producing bile

Explanation:

The jejunum is part of the small intestine. Villi are finger - like projections in the small intestine. Their main function is to increase the surface area available for the absorption of nutrients from digested food.

• Regulating water balance is more of a function of the large intestine (in part) and kidneys.
• Digestive enzymes are secreted by various glands (e.g., pancreatic enzymes from the pancreas, intestinal enzymes from the intestinal crypts, not primarily by villi).
• Mechanical digestion (e.g., chewing in the mouth, churning in the stomach) is not the role of villi.
• Bile is produced by the liver.

Answer:

Increasing surface area for absorption