71) Cholecystokinin from the intestinal wall is stimulated by the presence of

A) lipids and partially digested proteins in the duodenum.

B) acid in the stomach.

C) protein in the stomach.

D) fats in the stomach.

E) acid in the duodenum.

72) Plicae and intestinal villi

A) increase the absorptive surface area of the small intestine.

B) carry products of digestion that will not pass through the walls of blood capillaries.

C) produce new cells for the mucosa of the small intestine.

D) secrete digestive enzymes.

E) produce hormones.

73) Which of the following is a protease produced by the pancreas?

A) secretin

B) trypsin

C) amylase

D) nuclease

E) gastrin

74) Which of the following is the primary digestive organ involved in regulating the composition of circulating blood?

A) pancreas

B) stomach

C) small intestine

D) large intestine

E) liver

75) Pancreatic enzymes and buffers are secreted by which of the following?

A) chief cells

B) alpha cells

C) lobules

D) acinar cells

E) beta cells

76) Enzymes from the ________ do most of the digestive work in the small intestine.

A) pancreas

B) liver

C) gallbladder

D) stomach

E) large intestine

77) Bile salts break lipid droplets apart in a process called ________.

A) absorption

B) emulsification

C) bile storage

D) bile synthesis

E) secretion

78) The human liver is typically composed of ________ lobe(s).

A) one

B) two

C) three

D) four

E) five

79) Which structures of liver lobules ultimately merge to form the hepatic veins?

A) hepatic ducts

B) hepatic arteries

C) capillary beds

D) central veins

E) portal veins

80) The basic functional units of the liver are the

A) hepatocytes.

B) liver cells.

C) lobules.

D) portal areas.

E) bile canaliculi.