1. The stimulation of which reflex lumen of the GI tract can trigger a response
ID: 83971 • Letter: 1
Question
1. The stimulation of which reflex lumen of the GI tract can trigger a response without any involvement of the CNS?
a. long reflex
b. gastric-phase control reflex
c. cephalic-phase control reflex
d. short reflex
2.The force of gastric contraction increases in response to which of the following?
a.cholecystokinin (CCK)
b.gastrin c.secretin
c. glucose-dependent insulinotropic peptide (GIP)
3.The presence of protein digestion products and fats in the duodenum primarily stimulates the secretion of which of the following?
a.gastrin
b.cholecystokinin (CCK)
c.glucose-dependent insulinotropic peptide (GIP)
d.secretin
Explanation / Answer
1. ANS: c. cephalic-phase control reflex.
Explanation:
The cephalic phase of gastric secretion occurs even before food enters the stomach, especially while it is being eaten. It only occurs when we like or want food.
Long reflexes to the digestive system involve a sensory neuron that sends information to the brain.
2. ANS: b.gastrin
Explanation:
Regulation of Gastric Motility: The force of gastric contraction increases in response to gastrin and decreases in response to CCK, secretin and GIP.
3. ANS: b.cholecystokinin (CCK)
Explanation: The secretion of CCK is regulated primarily by the concentration of protein digestion products and fat in the duodenum.
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