NEET BIOLOGY

Detailed explanation-1: -The inside of the small intestine is lined with villi that absorb nutrients from the liquid mixture called chyme produced in the stomach from the food we eat. Biology books usually have a detailed picture of the villi.

Detailed explanation-2: -Covering the core of a villus is the surface mucous-membrane layer. This is mainly composed of two cell types: tall, narrow, columnar cells that absorb the substances passed into the blood and lymphatic vessels; and goblet cells, rounded at the end, that secrete mucus into the intestinal cavity.

Detailed explanation-3: -The walls of the small intestine are lined with a dense mucosa with many glands that both secrete and absorb. In the jejunum and the ileum, the mucosa secretes small amounts of digestive enzymes and lubricating mucus while absorbing nutrients from your food.

Detailed explanation-4: -The large intestine consists of the colon, rectum, and anal canal. The wall of the large intestine has the same types of tissue that are found in other parts of the digestive tract but there are some distinguishing characteristics. The mucosa has a large number of goblet cells but does not have any villi.

Detailed explanation-5: -The duodenum and jejunum contain villi, which are covered with absorbent cells (enterocytes with microvillous, brush border) as well as a very small number of goblet cells, with crypts of Lieberkühn between the villi.