Q:

Gastric is

safaTerkawi
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2022-08-09
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Gastric is

  1. Acid secretion in response to a lowered blood sugar is mediated by the hormone gastrin.
  2. Emptying is facilitated by sympathetic nerve activity.
  3. Acid secretion increases when histamine H2, muscarinic M1 or gastrin receptors are activ.
  4. Acid secretion is inhibited by the presence of food in the duodenum.
  5. Contraction waves pass over the stomach at a rate of about ten per minute.
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All Answers

safaTerkawi
2022-08-09
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A. False It is mediated through a vagal reflex and is absent in vagotomized stomachs.

B. False This delays gastric emptying.

C. True Histamine from mast-like cells activates H2 receptors, acetylcholine from para-sympathetic nerve endings activates M1 receptors and gastrin activates gastrin receptors.

D. True The neural/hormonal mechanisms responsible for the inhibition are not certain.

E. False The normal rate is around 3/minute.

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