Digestion Set 1

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This set of Digestion Multiple Choice Questions & Answers (MCQs) focuses on Digestion Set 1

Q1 | The Secretin hormone:
  • Is secreted by the pancrease.
  • Is released by the pyloric mucosa.
  • Contracts the gall bladder wall.
  • Increases the pancreatic Secretion of water and HCO3-.
Answer: Increases the pancreatic Secretion of water and HCO3-.
Q2 | I nhibition of the myenteric plexus leads to which of the following?
  • Increased Secretion of Secretin from the duodenum.
  • Decreased gut motility.
  • Hyperacidity in the stomach.
  • Diarrhea.
Answer: Decreased gut motility.
Q3 | the Secretion of gastrin cease(stop):
  • When the stomach is distended by meal.
  • When the PH of the gastric content is Decreased below 2.
  • If the fundic mucosa is anaesthesiz
Answer: When the PH of the gastric content is Decreased below 2.
Q4 | Stimulation of sub mucosal plexus result in an Increase in which ofthe following?
  • motility of the gut.
  • Secretion of the gut.
  • sphincter tone.
  • stomach PH.
Answer: Secretion of the gut.
Q5 | About the GIT hormones affecting gastric function:
  • CCK and Secretin Increase both gastric Secretion and motility.
  • gastrin Secretion is Stimulated by the digestive products of fat.
  • gastrin inhibits gastric Secretion and delay gastric emptying.
  • GIP and VIP inhibit gastric Secretion.
Answer: GIP and VIP inhibit gastric Secretion.
Q6 | Cholecystokinin:
  • Release is Stimulated by protein hydrolysates in the lumen of the small intestine.
  • Is released from gastric mucosal cells.
  • Release is Stimulated by distension of the colon.
  • A and C are correct.
Answer: Release is Stimulated by protein hydrolysates in the lumen of the small intestine.
Q7 | Amajor part of the gall bladder contractions are due to:
  • sympathetic contraction OF the viscus.
  • The overfilling of the gall bladder with bile.
  • The rate of cholesterol synthesis and excretion by the liver.
  • A hormone synthesized by duodenal mucosa .
Answer: A hormone synthesized by duodenal mucosa .
Q8 | The major factor that Stimulates the release of Secretin into the blood stream is:
  • An acid PH of the chyme entering the duodenum.
  • The para sympathetic StimulI.
  • Peptones in the gastric chyme that enter the duodenum.
  • A stomach full of digested contents.
Answer: An acid PH of the chyme entering the duodenum.
Q9 | It is known that gastrin:
  • It is a large protein molecule ,somewhat similar in size to pepsin.
  • Is not secreted by empty stomach when peristaltic movements may be quite forceful.
  • Reaches the secretory cells of the fundus of the stomach through the blood and not through the lumen.
  • Promotes the secretion of pepsin, but not that of HCL.
Answer: Reaches the secretory cells of the fundus of the stomach through the blood and not through the lumen.
Q10 | It is known that secretin:
  • It is a large protein hormone synthesized by the pancreas,together with pancreozymin.
  • Is a small polypeptide synthesized by the intestinal mucosa .
  • Neutralizes directly the acid chyme that passes through the pylorus.
  • Has an optimal activity at a PH equal to 8.4.
Answer: Is a small polypeptide synthesized by the intestinal mucosa .
Q11 | Secretin IS released by:
  • Acid in the duodenum.
  • Acid in the urine.
  • S cells in the duodenal mucosa.
  • Distension of the colon.
Answer: S cells in the duodenal mucosa.
Q12 | Concerning the gastrin hormone:
  • It is Secreted at the pyloric antrum and reaches the fundus tohrough the gastric lumen.
  • It Promotes the secretion of pepsin, but not HCL.
  • Its Secretion Stimulated by secretin and GIP.
  • It is structurally similar to CCK .
Answer: It is structurally similar to CCK .
Q13 | About the GIP,all the following are true except:
  • It is secreted from the duodenal mucosa.
  • It has +ve feedback effect on gastric Secretion and motility.
  • Its release is Stimulated by presence of excess fat.
  • It inhibit both gastric Secretion and motility.
Answer: Its release is Stimulated by presence of excess fat.
Q14 | The GIT hormone are characterized by all the following except:
  • They are secreted by APUD system and are divided into 2 families on The basis of their structural similarity.
  • They are secreted in response to specific physiological Stimuli during digestion.
  • Their effects are abolished by cutting the nervous connections of GIT.
  • They affect areas in GIT that may be far away from the sites of their release.
Answer: Their effects are abolished by cutting the nervous connections of GIT.
Q15 | About the GRP,all the followings are true except:
  • It inhibit the intestinal motility.(through librating gastrin).
  • It increase the gastric secretion . .(through librating gastrin).
  • It increase the pancreatic secretion . .(through librating gastrin).
  • It is found in the hypothalamus.(in addition to GIT)
Answer: It inhibit the intestinal motility.(through librating gastrin).
Q16 | all the followings are correct about gastrin except:
  • It is stimulated by distension of antrum.
  • It is stimulated by insulin induced hypoglycemia.
  • Its secretion is increased by secretin.
  • none
Answer: Its secretion is increased by secretin.
Q17 | Apatient with trigeminal lesion would have the greatest difficulty with which of the following?
  • Swallowing.
  • Chewing.
  • Receptive relaxation of the upper esophageal sphincter
  • Secondary prestalsis in the esophagus.
Answer: Chewing.
Q18 | Mastication:
  • Is entirely a voluntary act.
  • Includes both voluntary and reflex components.
  • Is performed by muscles supplied by 7th (facial nerve).
  • It is normally initiated by conditioned reflexes.
Answer: Includes both voluntary and reflex components.
Q19 | Man is unable to digest dietary:
  • GLYCOGEN.
  • Dextrin.
  • Saccharose.
  • Cellulose.
Answer: Cellulose.
Q20 | The salivary amylase:
  • Is also called ptyalin and it is beta amylase.
  • Is the only amylase in GIT.
  • Digest mainly cooked starch.
  • Is activated by either HCL or ca++
Answer: Digest mainly cooked starch.
Q21 | During the chewing of a bolus of food, but before Swallowing, salivary secretion ,gastric secretion and pancreatic secretion are stimulated by which the following?
  • Acetylecholine,gastrin,histamine.
  • Acetylecholine,CCK,nitric oxide.
  • Nitric oxide,VIP, histamine.
  • VIP, gastrin,Somatostatin.
Answer: Acetylecholine,gastrin,histamine.
Q22 | Thesalivary secretion:
  • Is rich in glucose.
  • Is Produced by a nervous mechanism Only.
  • digests starch to glucose.
  • Has the largest volume relative to other digestive juices.
Answer: Is Produced by a nervous mechanism Only.
Q23 | About salivary glands, which of the following statement is true?
  • T heir secretion is mainly under hormonal control.
  • The sym . system is the Only natural pathway for stimulatation of their secretion.
  • Both sympathetic and parasympathetic nerves stimulate t heir secretion.
  • Bradykinin decrease their blood flow rate.
Answer: Both sympathetic and parasympathetic nerves stimulate t heir secretion.
Q24 | The saliva (true or false)?
  • Contains no organic substances.
  • Is markedly increase in amount after sympathetic stimulatation.
  • secretion is increased after injection of atropine.
  • secreted by submandibular glands is about 70%of the total secretion .
Answer: secreted by submandibular glands is about 70%of the total secretion .
Q25 | The presentation of a bolus of solid food to the mouth:
  • stimulates taste buds.
  • Is usually followed by Mastication.
  • Reflexively stimulates The salivary glands.
  • All are correct.
Answer: All are correct.
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