what are villi? what role do they play in digestion in human beings?
Answers
Villus, plural villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. Important villous membranes include the placenta and the mucous-membrane coating of the small intestine. OR Capillaries move blood the entire length of the villus. When the villi absorb nutrients like water soluble vitamins, amino acids and sugars, they are transported into the capillaries for distribution and use throughout the body. The villi also contain vessels called lacteals. Lacteals are part of the lymphatic system. FUNCTIONS: These villi increase the surface area for more efficient food absorption. Within these villi, are present numerous blood vessels which absorb the digested food and carry it to the blood stream.
Answer:
villi is the finger like projections of tissue that are present in the intestine and it increase the surface area for food .
Explanation:
It contain specialized cells that support substances into the bloodstream .Although these villi do not help in the digestion of nutrients,they do help with nutrient absorption..