Question

78.) Hydrochloric acid (HCl) is secreted by __________ cells.

enteroendocrine

chief

mucous

regenerative (stem)

parietal

79.) Several digestive enzymes (proteases) are secreted as zymogens because __________.

gastric cells do not have the necessary enzymes for their synthesis

it saves one step in their synthesis

they will act only in the stomach lumen and will not digest intracellular proteins

they start digesting intracellular proteins of the gastric cells more quickly

they can start digesting dietary proteins more quickly

80.) A hepatic triad consists of __________.

the hepatic portal vein and two hepatic ducts

a bile ductule, a branch of the hepatic artery, and a branch of the hepatic portal vein

the right, left, and common hepatic ducts

a central vein, a hepatic lobule, and a hepatic sinusoid

the common hepatic duct, cystic duct, and bile duct

81.) The __________ synthesizes bile acids by metabolizing __________.

duodenum; neutral fats

ileum; bilirubin

liver; cholesterol

pancreas; bile salts

gallbladder; cholesterol

82.) Wavelike muscular contraction of the gastrointestinal tract is called

segmentation.

peristalsis.

deglutition.

mastication.

Answer 1

78.

parietal

The parietal cells of the stomach's epithelial lining secrete Hydrochloric acid (HCl). These cells do this by pumping H+ ions and Cl- ions separately into the lumen of the stomach.

79.

they will act only in the stomach lumen and will not digest intracellular proteins

Gastric proteases and peptidases are releasedas Zymogens so that these enzymes do not digest the cellular proteins. The release of zymogen also ensures that the enzymes are only active when there is food (chyme) in the stomach and the stomach lumen has been acidified by the addition of HCl.

80.

a bile ductule, a branch of the hepatic artery, and a branch of the hepatic portal vein

The hepatic triads are the meeting points of the hepatic artery, the hepatic portal vein and a bile ductule along with a lymph vessel. Hepatic triads occur at the junctions of the lobules of the liver.

81.

gallbladder; cholesterol

The gallbladder secretes the bile. Bile is an import part of digestion as it allows the intestine to absorb fats by turning them into miscelles.

82.

peristalsis

Peristalsis is the motion that propels food through the gastro-intestinal tract. Peristalsis is also important for maintaining the constant flow rate of food for imporved absorbtion of nutrients.