Answers Practice MT 1

Answers Practice MT 1 - Midterm 1 Example Questions 1 You...

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Midterm 1 Example Questions 1) You isolated a single nerve fiber that innervates the GI tract. You discovered that the nerve's cell body resides in the spinal cord and that stimulation of the nerve decreased GI peristalsis. What is this nerve and what neurotransmitter does it release? a. Preganglionic parasympathetic neuron, acetylcholine b. Inhibitory intrinsic motor neuron, VIP c. Postganglionic parasympathetic neuron, VIP d. Preganglionic sympathetic neuron, acetylcholine e. Postganglionic sympathetic neuron, norepinephrine 2) Extrinsic primary afferents, but not intrinsic primary afferent, are important for sensing. .. a. Muscle tension or distension b. Mechanical stimuli of the mucosa c. Painful stimuli d. Chemicals e. Only two of the above are correct answers to this question 3) Contraction of the outer longitudinal muscle of the muscularis externa causes. .. a. Decreased diameter of the GI lumen b. Endocrine secretions c. Vasodilation d. Shortening of the length of GI tract e. All of the above 4) A genetic mutation causes your patient to produce little, if any, secretin. Which features would you expect to observe in this patient? a. Atrophy of the pancreas b. Low gastric acid secretion rates c. Gall bladder hypertrophy d. Low GI motility e. High secretion rates by the gall bladder 5) Your patient has a mutation such that his saliva, in response to stimulation by food cues, contains lower than normal HCO 3 - . What might be the mutation? (Apical membrane: faces lumen. Basolateral membrane: faces capillaries) a. The acinar cell Na + /K + ATPase works slowly b. Activity of the HCO 3 - /Cl - transporter is increased in duct cells c. The Na + /H + exchanger in duct cells is not functioning d. The patient's blood contains very little dissolved HCO 3 - e. Cl - channels are blocked at the apical membrane of acinar cells.
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6) Drug X inhibits only intrinsic enteric nerves. If a patient took drug X, which of the following would be TRUE ? a. He cannot perceive GI pain b. Frightful stimulation will not cause GI vasoconstriction c. Smelling food will not elicit salivary secretion d. All GI reflexes will be absent e. None of the above will be TRUE of his tract 7) Which of the following characteristics is TRUE of intrinsic efferent nerves? They sense chemicals
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Answers Practice MT 1 - Midterm 1 Example Questions 1 You...

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