Question

what is the function of folds and villi? a. trapping food particles that flow through the small intestines b. increasing surface area to improve nutrient absorption between the digestive and circulatory systems c. expanding volume to increase gas exchange from the respiratory system to the digestive system d. allowing particles in the small intestines to flow from the jejunum to the ileum

Explanation:

Folds and villi in the small intestine increase the surface - area. This enhanced surface - area is crucial for better absorption of nutrients from digested food into the bloodstream, improving the efficiency of nutrient transfer between the digestive and circulatory systems.

Answer:

B. increasing surface area to improve nutrient absorption between the digestive and circulatory systems