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Home / Questions / When eaten, nearly 90% of our dietary calories from fat are in the form of A) steroids.

When eaten, nearly 90% of our dietary calories from fat are in the form of A) steroids.

When eaten, nearly 90% of our dietary calories from fat are in the form of

A) steroids.

B) phospholipids.

C) triglycerides.

D) cholesterol.

E) fat-soluble vitamins.

32) Bile is

A) secreted by hepatocytes only.

B) manufactured by the gallbladder only.

C) released into the stomach only.

D) secreted by hepatocytes and manufactured by the gallbladder.

E) secreted by hepatocytes, manufactured by the gallbladder, and released into the stomach.

33) Functions of the large intestine include

A) chemical digestion of chyme.

B) temporary food storage.

C) resorption of water and compaction of feces.

D) absorption of the products of digestion.

E) All of these answers are correct.

34) The release of many GI tract hormones is stimulated by a particular food or substance. Which hormone is INCORRECTLY paired with its stimulus?

A) CCK — fatty foods

B) secretin — acid in the small intestine

C) GIP — glucose in the small intestine

D) motilin — acid in the stomach

E) gastrin — peptides, increased sympathetic activity

35) During the cephalic phase of gastric secretion,

A) the stomach responds to distention.

B) secretin inhibits parietal and chief cells.

C) there is an increased flow of action potentials along the vagus nerve to the stomach.

D) the intestine reflexively inhibits gastric emptying.

E) production of gastric juice slows down.

36) The gastric phase of gastric secretion is triggered by

A) the sight, thought, or smell of food.

B) the entry of food into the stomach.

C) the entry of chyme into the small intestine.

D) the entry of chyme into the large intestine.

E) the release of cholecystokinin and secretin by the small intestine.

37) An enzyme that will digest proteins into peptides is

A) lipase.

B) amylase.

C) nuclease.

D) maltase.

E) trypsin.

38) Most products of fat digestion are absorbed by

A) capillaries.

B) veins.

C) lymphatic vessels.

D) arterioles.

39) Which of the following statements is true about GI muscle contractions?

A) Phasic contractions last only seconds and occur in the stomach and small intestine.

B) Tonic contractions are sustained for minutes and occur in the small intestine.

C) Cycles of smooth muscle contraction and relaxation are associated with fast wave potentials.

D) Contractions of the smooth muscle do not depend on calcium.

E) None of these statements are true.

40) Which of the following statements is true?

A) Glucose and galactose absorption uses an apical Na+-glucose SGLT symporter.

B) Fructose moves across the apical membrane by active transport.

C) Glucose and galactose use different transporters in absorption.

D) A basolateral GLUT5 transporter moves glucose out of the intestinal epithelial cell.

E) None of the statements are true.

41) Bicarbonate secretion

A) neutralizes acid entering from the stomach into the duodenum.

B) is secreted by apical Cl--HCO3- antiport.

C) is not dependent on high levels of carbonic anhydrase to maintain bicarbonate production.

D) is secreted by the acinar cells.

E) neutralizes acid entering from the stomach into the duodenum and is secreted by apical Cl--HCO3- antiport.

42) Saliva is

A) slightly acidic, with a pH of 6-7.

B) controlled by the autonomic nervous system.

C) stimulated by sympathetic innervation.

D) secreted from endocrine glands.

E) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system.

Dec 11 2019 View more View Less

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