Question

structures in the digestive tract that increase surface area for absorption are called: a alveoli b villi c arterioles d venules

Explanation:

• Alveoli are in the lungs, not the digestive tract.
• Villi are finger - like projections in the small intestine that increase surface area for absorption.
• Arterioles are small arteries and venules are small veins, neither related to increasing digestive tract absorption surface area.

Answer:

B. villi