Answer:
layers of cell membranes- micro villi
Explanation:
They are similar to cilia but shorter in length and diameter.They have average diameter of micrometer with average length of 2 micrometer
These are layers of cells membrane which protrudes or extended on the epithelial lining of the small intestine.They are microscopic in structure,and their major function is to increase the surface area of the small intestine for absorption of digested food substances. Therefore reducing volume while aiding the rapid movement of the digested food into the bloodstreams.
Aggregate of micro villi is called brush border on the surface of the small intestine. Their activity with the villi aids the increase in the surface area which leads to absorption of food substances
