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.