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38 Cards in this Set
- Front
- Back
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The wall of the digestive tract is composed of
a) mucosa b) submucosa c) muscularis externa d) serosa e) all of the above |
Mucosa - eptithelial, lamina propria
& muscularis mucosa Submucosa - lymph vessels (PEYERS PATCH) exocrine glands plexus Muscularis externa - circular muscle longitudinal muscle nerves Serosa - connective tissue |
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The salivary glands and pancreas contain clusters of exocrine secretary cells called
a) acini b) spanchnic cells c) peptic cells |
acini
empty into mouth or duodenum |
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Which 2 systems are regulated by the body
a) motility b) digestion c) secretion d) absorption |
motility
secretion |
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Mixing occurs when smooth muscles in small segments of the tube contract rhythmically and
a) cause forward movement b) do not cause forward movement c) cause wavelike movements |
do not cause forward movement
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Propelling is a
a) forward movement b) does not cause forward movement c) alternating sections |
forward movement
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True/False short reflexes are integrated in the CNS
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False! short reflexes are integrated in the enteric nervous system "little brain"
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The enteric nervous system (short reflexes) controls
a) motility b) secretion c) growth d) a & b e) a, b & c |
a, b & c
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True / False the short reflexes can be both excitatory and inhibitory
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True
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Long reflexes are mediated by
a) enteric nervous system b) CNS c) both a & b |
CNS
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Stimulus for sensory receptors and neurons in GI track include
a) pH b) stretch c) osmolarity d) products of digestion e) all of the above |
all of the above
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The plexus involved with the short reflexes are
a) submucosal b) myenteric c) sphlanchnic d) vagus e) both a & b |
both a & b
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True/False Sympathetic neurons inhibit GI function
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True, parasympathetic EXCITES/ENHANCE GI
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Which of the following hormones are important in the control of motility and secretion
a) gastrin b) chlecystokinin (CCK) c) secretin d) GIP e ) all of the above |
all of the above
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What is the function of GIP (glucose dependent insulin tropic peptide)?
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increase insulin secretion
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Gastrin is secreted by
a) gallbladder b) g cells c) chief cells d) parietal cells |
g cells
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Parietal cells secrete
a) gastric acid (HCL) b) somatostatin c) gastrin d) intrinsic factor e) both a & d |
HCL
intrinsic factor |
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Chief cells secrete
a) pepsinogen b) HCL c) gastrin d) somatostatin |
pepsinogen
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Enterochromaffin-like cells secrete
a) pepsinogen b) gastrin c) somatostain d) histamine |
histamine
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True/False chewing is completely reflexive
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False, only partly because even though we decide to chew we give no thought to how fast or slow
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Salivary secretion lubricates the mouth and starts the digestion of
_______________ |
starch
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Which of the following are salivary glands
a) parotid b) submaillary c) sublingual d) all of the above |
all of the above
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True/False Amylase is the enzyme that breaks long glucose polymers into smaller chains so that they can be digested
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true
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What are the major components of saliva
a) water b) mucus c) amylase d) all of the above |
all of the above
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Salivation is regulated by
a) short reflexes b) long reflexes c) none of the above |
long reflexes
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True/False BOTH
PSNS & SNS stimulate salivation, with PSNS being more dominant |
True
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True/False the major function of the stomach is to store food
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true
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The swallowing center is located in
a) medulla b) brain stem c) pons d) none of the above |
medulla
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Primary peristalsis is mediated by
a) short reflexes b) long reflexes |
long reflexes
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What is the function of secretin
a) inhibits acid production b) slows gastric emptying c) stimulates production of pancreatic HCO3 to neutralize the acid d) all of the above |
all of the above
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What is the function of CCK
a) slow gastric motility b) slow acid secretion c) a only d) both a & b |
both a & b
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What is the limit ( capacity of a completely relaxed stomach
a) 2.5L b) 1.5L c) 3.5L |
1.5L
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True/False myogenic mechanism a basic electrical rhythm helps regulate stomach motility
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true
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True /False Mechanoreceptors in the gastric wall trigger stomach motility and are mediated by both short and long reflexes
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True
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What is the function of gastrin
a) increase peristalsis b) increase HCL formation c) slow peristalsis for digestion |
increase peristalsis
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Pepsinogen is the precursor for pepsin because if the chief cell secreted pepsin, the pepsin would
a) digest the chief cell b) cause erosion in the stomach c) none of the above d) both a & b |
digest the chief cell
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True/False the mucous layer acts as a physical barrier to protect the stomach lining
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true
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HCL secretion is regulated by
a) short reflexes b) long reflexes c) both a & b |
both a &b
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True/False The ideal pH for pepsin is
2 - 3 which means it will stop working once in duodenum |
true
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