Q:

Gastric juice

safaTerkawi
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2022-08-09
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 Gastric juice.

  1. Is secreted when the vagus nerves are stimulated.
  2. Is secreted in vagotomized animals when food is chewed but not swallowed.
  3. Inactivates the digestive enzymes secreted with saliva.
  4. Does not digest the gastric mucosa because it is protected by a pepsin inactivator.
  5. Irritates the oesophageal mucosa if regurgitated from the stomach.
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safaTerkawi
2022-08-09
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A. True Vagal stimulation increases acid and pepsinogen secretion; this action is mediated by acetylcholine and gastrin-releasing peptide released from the vagal nerve endings.

B. False After vagotomy, food must enter the stomach to stimulate gastric secretions.

C. True Salivary enzymes are not effective at the low pH of gastric juice.

D. False But mucosal cells are protected by a coat of mucus impregnated with bicarbonate.

E. True This is normally prevented by the cardiac sphincter.

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