Answer: Option B. "increase the surface area of the mucosa of the small intestine."
Explanation:
Circular folds and intestinal villi present in small intestine and performs function of increasing the surface area of mucosa and support absorption.
The circular folds are projected towrads lumen in small intestine showing valvular flaps. The circular folds are further covered by finger like projection called intestinal villi.
The circular folds functions by slowing down the passage of food which is partly digested and with the help of villi it increases the mucosal surface area and further support absorption of fatty acids in blood.
Hence, the correct option is B.
Question:
What is the function of folds and villi?
A. increasing surface area to improve nutrient absorption between the digestive and circulatory systems
B. expanding volume to increase gas exchange from the respiratory system to the digestive system
C. allowing particles in the small intestines to flow from the jejunum to the ileum
D. trapping food particles that flow through the small intestines
Answer:
A. increasing surface area to improve nutrient absorption between the digestive and circulatory systems
Explanation:
In photo below
