Hormonal Regulation of Digestion

This video explores the roles of gastrin, secretin, and cholecystokinin (CCK) in digestion. Gastrin regulates stomach digestion by controlling pH, enzyme function, and motility. Secretin and CCK manage digestion in the duodenum by adjusting pH and enzyme release. These hormones also have non-digestive roles, such as tissue growth and potential links to cancer. Understanding these functions is crucial for maintaining digestive health and preventing disease.

What is the primary role of gastrin in the stomach?

• To inhibit smooth muscle contraction

• To produce bile salts

• To increase the pH of the stomach

• To stimulate the secretion of hydrochloric acid

Which cells in the stomach secrete gastrin?

• Chief cells

• Mucous cells

• Parietal cells

• G cells

What triggers the release of secretin in the duodenum?

• Presence of carbohydrates

• Low pH and presence of fats and proteins

• High pH and presence of bile

• Presence of hydrochloric acid

How does CCK affect the pancreas?

• It inhibits the production of digestive enzymes

• It stimulates the production and release of digestive enzymes

• It reduces the secretion of bicarbonate ions

• It increases the pH of the stomach

What is the optimal pH for digestive enzymes in the duodenum?

• 7-8

• 5-6

• 3-4

• 1-2

Which hormone stimulates the liver and gallbladder to release bile salts?

• Insulin

• CCK

• Secretin

• Gastrin

What is a non-digestive function of gastrin?

• Stimulating bile production

• Inducing growth of healthy mucosal cells in the stomach

• Regulating water homeostasis in the kidneys

• Inhibiting smooth muscle contraction

Which receptor can both gastrin and CCK bind to?

• CCK1 receptor

• CCK2 receptor

• Gastrin receptor

• Parietal receptor

What is a potential risk associated with the growth factor function of gastrin and CCK?

• Reduction in immune response

• Induction of cancerous tissue growth

• Development of ulcers

• Increased risk of diabetes

What role does secretin play in the heart?

• Influences contractility

• Stimulates bile production

• Regulates pH levels

• Inhibits enzyme secretion