Mucus production to form the mucosal barrier in the stomach is ...

[Starlight]

Mucus production to form the mucosal barrier in the stomach is stimulated by the release of:
 
  a. somatostatin.
  b. gastrin.
  c. prostaglandins.
  d. histamine.

Question 2

Which sphincter prevents reflux of digested material from the colon into the small intestine?
 
  a. Haustral
  b. Lower esophageal
  c. Pyloric
  d. Ileocecal valve

[reversalruiz]

Answer to Question 1

ANS: C
Prostaglandins protect the mucosal barrier by stimulating the secretion of mucus and bicarbonate and by inhibiting secretion of acid. Somatostatin is secreted by the pancreas and is not involved in secretion of mucus. Gastrin is not involved in mucus secretion. Histamine initiates secretion of acid, not mucus.

Answer to Question 2

ANS: D
The ileocecal valve prevents reflux of digested material from the colon into the small intestine. The haustral segments facilitate propulsion; they do not prevent reflux. Lower esophageal pre-vents reflux from the stomach to the esophagus. The pylorus is the opening between the stomach and the duodenum.