NEET Practice Questions (MCQs) with Answers & Solutions

The intestinal mucosal epithelium has goblet cells which secrete mucus. The secretions of the brush border cells of the mucosa alongwith the secretions of the goblet cells constitute the intestinal juice. (page-263).

The intestinal mucosal epithelium has goblet cells which secrete mucus. The secretions of the brush border cells of the mucosa alongwith the secretions of the goblet cells constitute the intestinal juice or succus entericus. (page-263)

(page-265)

Some of the substances like fructose and some amino acids are absorbed with the help of the carrier ions like sodium ions. This mechanism is called the facilitated transport. (page-264)

Nutrients like amino acids, monosacharides like glucose, electrolytes like Na⁺ are absorbed by active transport which occurs against the concentration gradient and thus requires energy. (page-265)

Fatty acids and glycerol are first incorporated into small droplets called micelles which move into the intestinal mucosa. They are re-formed into very small protein coated fat globules called the chylomicrons which are transported into the lymph vessels (lacteals) in the villi. These lymph vessels ultimately release the absorbed substances into the blood stream. (page- 265)

Amylase is secreted in pancreatic juice. Gastric juice contains hydrochloric acid and enzymes like rennin, pepsin, etc. (page-262)

Trypsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa into active trypsin, which in turn activates the other enzymes in the pancreatic juice (page-262).

The bile duct and the pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of Oddi. (page- 261).