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Exam 4: Gastric Secretion and Vomiting

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Question 21

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A likely reason why a to and fro motion, such as that encountered during airplane flights or in an automobile ride over a bumpy road, tends to cause nausea and vomiting, is because during such motions:

A) Much air is swallowed and the stomach becomes distended
B) The stomach is more likely to develop reverse peristalsis
C) The cerebral cortex can no longer inhibit an intrinsic tendency of the brainstem to cause vomiting
D) Vestibular reflex eventually excite a chemoreceptor trigger zone in the medulla

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Question 22

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Concerning HCl secretion, all the following is true except:

A) It's associated with increased PH of the gastric venous blood
B) It's stimulated by gastrin, acetylcholine,histamine and norepinephiren
C) The energy required is derived from ATP breakdown
D) It involves formation of carbonic acid

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Question 23

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Which of the following substances is released from the duodenal mucosa in response to acidic gastric juice?:

A 42years old salesman presents with the chief complaint of intermittent midepigastric pain that is relieved by antacids or eating. Gatric analysis reveals that basal and maximal acid output exceed normal values. The gastric hypersecretion can be explained by an increase in the plasma concentration of which of the following?:

All the following statements are true except: