Among the options provided, select the accurate statements regarding the characteristics of villi. Choose the correct combination of statements from the options below:
(A) Villi actively secrete digestive enzymes to aid in the digestion process.
(B) Villi possess an extensive network of blood vessels for efficient nutrient absorption.
(C) Villi contribute to a contraction of the surface area within the small intestine.
(D) Villi are finger-like projections located on the exterior surface of the small intestine.
A only
B only
C only
D only
Villi are finger-like projections found on the inner lining of the small intestine, and they are richly supplied with blood vessels. The presence of numerous blood vessels allows for the efficient absorption of nutrients from the digested food passing through the small intestine. The network of blood vessels helps transport the absorbed nutrients to the bloodstream for distribution to the rest of the body. Therefore, Option 2 is the correct answer.