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السؤال 30

Villi and microvilli are projections along the small intestine. How do they support nutrient uptake?

  1. They reduce the area exposed to digested food.
  2. They act as valves that control swallowing.
  3. They increase the area available for absorption.الإجابة الصحيحة
  4. They grind food into smaller physical pieces.

الشرح

These many projections greatly enlarge the membrane area available for absorbed nutrients to cross. They do not grind food, because their contribution is providing exchange surface rather than mechanical force.

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السؤال 30: Villi and microvilli are projections along the small… · Human Body Systems · Questena