Question

The small intestine has special structures, called villi, which help absorption of digested food. Which of the following is NOT a feature?

B1. Good blood supply
B2. Impermeable walls
B3. Large surface area
B4. Thin layer of cells

Answer 1

B2) Impermeable walls

Villi together with it's microvilli tremendously increase surface area of absorption. And hence supports effective absorption of nutrients into blood. Villi have permeable membranes . Thus, nutrients can easily get their way through them.