Exam 4 (Digestive System HW)

lysozyme

kills bacteria

electrolytes

salts, phosphate, and bicarbonate

Mucous cells

secrete mucus and predominate in the cardia and pyloris

Mass movements of the colon are integrated by

the enteric plexus.

Which of the following occurs during the gastric phase of gastric secretion?

All of these take place in the gastric phase

True or False. When chyme enters the duodenum, gastric secretion increases.

False

Which of the following enzymes is produced by the stomach?

Pepsin

In simple terms sucrase

breaks sucrose into glucose and fructose.

salivary amylase

digest starch

lingual lipase

digests fat

Regenerative cells

divide rapidly and provide a continuous supply of new cells

Which of the following is a function of the bacterial flora?

Bacteria digest cellulose. Bacteria synthesize vitamin C.

In which direction do the peristaltic contractions of stomach smooth muscle move contents?

From the fundus to the pyloris

________stimulation via the ________ nerve causes the secretion of HCl in the stomach.

Parasympathetic; vagus

True or False. If two different people can consume the same food, it is possible that one receives a different number of calories from that food because of differing bacterial populations in the large intestine.

True

immunoglobulin A

antibacterial antibody

Ion exchange molecules in the plasma membrane of the parietal cells exchange __________ ions going out for __________ ions coming in.

bicarbonate; chloride

mucus

binds and lubricates the food bolus

In the parietal cells, the enzyme carbonic anhydrase causes a reaction between _________ and _________.

carbon dioxide and water

Gastric secretion begins during the ________ phase and ends during the ________ phase.

cephalic; intestinal

The network of nerves that regulate digestive motility, secretion, and blood flow is called the

enteric nervous system.

Chief cells

secrete digestive enzymes gastric lipase and pepsinogen

Enteroendocrine cells

secrete hormones and paracrine messengers

Parietal cells

secrete hydrochloric acid, intrinsic factor, and ghrelin

In order for digestion to occur, chyme is required to contact the microvilli of the intestinal wall because

the brush border enzymes are not secreted into the lumen.