Lecture Quiz 4A

Flashcards about digestion and absorption

Which is the correct order for the digestion and absorption of lipids? 1. Digestion by pancreatic lipase. 2. Simple diffusion of the contents in micelles. 3. Exocytosis of chylomicrons. 4. Reformation of triglycerides. 5. Digestion by gastric lipase. 6. Emulsification by bile salts.

B. 5, 6, 1, 2, 4, 3

Trypsin is a pancreatic protease.

A. True

Which is the function of the hepatic portal system?

B. It allows for blood containing nutrients, toxins and wastes to go directly to the liver.

Which are the functions of the large intestine?

C. Secretion, propulsion and defecation.

The mass movements of the large intestine are stimulated by food consumption and reflexes of the enteric nervous system.

A. True

Which is a correct statement regarding the function of bacteria of the large intestine?

E. All the above (A-D) are functions of bacteria in the large intestine.

Which is a correct statement about water absorption in the digestive system?

D. 0.1 liter of water is excreted in feces.

Which will reduce acid secretion?

D. Somatostatin and secretin.

All are examples of positive feedback in the digestive system EXCEPT:

D. Somatostatin secretion.

The enterogastric reflex will increase acid secretion.

B. False

Which increases secretion of bicarbonate?

D. Secretin.

Parasympathetic neurons cause the smooth muscle of the sigmoid colon to contract and the internal anal sphincter to relax.

A. True

Which best describes absorption?

D. Movement of nutrients through alimentary canal wall into the blood or lymphatic vessels.

Which salivary gland produces the greatest amount of saliva?

B. Submandibular gland.

Which component of saliva binds antigens on pathogens?

C. Secretory IgA.

The submandibular and sublingual glands are innervated by the facial nerve.

A. True.

Which best describes the inferior third of the esophagus?

A. Only smooth muscle.

The voluntary phase of deglutition is controlled by the cerebral cortex.

A. True.

Which are the major functions of the stomach?

D. Secretion, propulsion and digestion.

Which is produced by chief cells?

C. Pepsinogen.

Hydrochloric acid is formed inside the cells of gastric glands.

B. False.

Which processes occur in the small intestine?

B. Secretion, digestion, absorption and propulsion.

Which is an example of chemical digestion?

D. Hydrolysis.

Where are carbohydrates digested?

A. Mouth and small intestine.

How is glucose absorbed across the brush border membrane?

C. Secondary active transport.