Chapter 92 Small Intestine

Question 1

What are the benefits of serosa in healing

Answer 1

Fibrin seal and providing pluripotent mesothelial cells

Question 2

Major blood supply to the small intestine

Answer 2

Cranial mesenteric artery

Question 3

Venous drainage of the small intestine

Answer 3

Mainly portal vein. Cranial mesenteric collects from jejunum, ileum, and caudal duodenum then dumps into portal vein
The gastroduodenal vein drains proximal duodenum and dumps into portal

Question 4

What is absorbed in the small intestine

Answer 4

Carbohydrates, proteins, lipids, fat and water soluble vitamins, Calcium, and Fe2+

Question 5

What is absorbed in the ileum and what is the mechanism?

Answer 5

Cobalamin (B12) and bile salts – mechanism: intrinsic factor*

Question 6

What is cholecystokinins role

Answer 6

When digested food enters the duodenum, cholecystokinin is released from cells in the mucosal surface of the small intestine, resulting in gallbladder contraction, and relaxation of the sphincter of Oddi, this facilitating passage of bile into the duodenum.
Cholecystokinin also stimulates secretion of digestive enzymes.

Question 7

What is secretins role

Answer 7

In the pancreas, secretin stimulates secretion of large volumes of bicarbonate-rich fluid that is important for neutralization of gastric acid within the duodenum