Digestion solved MCQs

1 of 8

1. The Secretin hormone:

a. Is secreted by the pancrease.

B. Is released by the pyloric mucosa.

c. Contracts the gall bladder wall.

d. Increases the pancreatic Secretion of water and HCO3-.

2. I nhibition of the myenteric plexus leads to which of the following?

a. Increased Secretion of Secretin from the duodenum.

B. Decreased gut motility.

c. Hyperacidity in the stomach.

d. Diarrhea.

3. the Secretion of gastrin cease(stop):

a. When the stomach is distended by meal.

B. When the PH of the gastric content is Decreased below 2.

c. If the fundic mucosa is anaesthesiz

4. Stimulation of sub mucosal plexus result in an Increase in which ofthe following?

a. motility of the gut.

B. Secretion of the gut.

c. sphincter tone.

d. stomach PH.

5. About the GIT hormones affecting gastric function:

a. CCK and Secretin Increase both gastric Secretion and motility.

B. gastrin Secretion is Stimulated by the digestive products of fat.

c. gastrin inhibits gastric Secretion and delay gastric emptying.

d. GIP and VIP inhibit gastric Secretion.

6. Cholecystokinin:

a. Release is Stimulated by protein hydrolysates in the lumen of the small intestine.

B. Is released from gastric mucosal cells.

c. Release is Stimulated by distension of the colon.

d. A and C are correct.

7. Amajor part of the gall bladder contractions are due to:

a. sympathetic contraction OF the viscus.

B. The overfilling of the gall bladder with bile.

c. The rate of cholesterol synthesis and excretion by the liver.

d. A hormone synthesized by duodenal mucosa .

8. The major factor that Stimulates the release of Secretin into the blood stream is:

a. An acid PH of the chyme entering the duodenum.

B. The para sympathetic StimulI.

c. Peptones in the gastric chyme that enter the duodenum.

d. A stomach full of digested contents.

9. It is known that gastrin:

a. It is a large protein molecule ,somewhat similar in size to pepsin.

B. Is not secreted by empty stomach when peristaltic movements may be quite forceful.

c. Reaches the secretory cells of the fundus of the stomach through the blood and not through the lumen.

d. Promotes the secretion of pepsin, but not that of HCL.

10. It is known that secretin:

a. It is a large protein hormone synthesized by the pancreas,together with pancreozymin.

B. Is a small polypeptide synthesized by the intestinal mucosa .

c. Neutralizes directly the acid chyme that passes through the pylorus.

d. Has an optimal activity at a PH equal to 8.4.

11. Secretin IS released by:

a. Acid in the duodenum.

B. Acid in the urine.

c. S cells in the duodenal mucosa.

d. Distension of the colon.

12. Concerning the gastrin hormone:

a. It is Secreted at the pyloric antrum and reaches the fundus tohrough the gastric lumen.

B. It Promotes the secretion of pepsin, but not HCL.

c. Its Secretion Stimulated by secretin and GIP.

d. It is structurally similar to CCK .

13. About the GIP,all the following are true except:

a. It is secreted from the duodenal mucosa.

B. It has +ve feedback effect on gastric Secretion and motility.

c. Its release is Stimulated by presence of excess fat.

d. It inhibit both gastric Secretion and motility.

14. The GIT hormone are characterized by all the following except:

a. They are secreted by APUD system and are divided into 2 families on The basis of their structural similarity.

B. They are secreted in response to specific physiological Stimuli during digestion.

c. Their effects are abolished by cutting the nervous connections of GIT.

d. They affect areas in GIT that may be far away from the sites of their release.

15. About the GRP,all the followings are true except:

a. It inhibit the intestinal motility.(through librating gastrin).

B. It increase the gastric secretion . .(through librating gastrin).

c. It increase the pancreatic secretion . .(through librating gastrin).

d. It is found in the hypothalamus.(in addition to GIT)

16. all the followings are correct about gastrin except:

a. It is stimulated by distension of antrum.

B. It is stimulated by insulin induced hypoglycemia.

c. Its secretion is increased by secretin.

d. none

17. Apatient with trigeminal lesion would have the greatest difficulty with which of the following?

a. Swallowing.

B. Chewing.

c. Receptive relaxation of the upper esophageal sphincter

d. Secondary prestalsis in the esophagus.

18. Mastication:

a. Is entirely a voluntary act.

B. Includes both voluntary and reflex components.

c. Is performed by muscles supplied by 7th (facial nerve).

d. It is normally initiated by conditioned reflexes.

19. Man is unable to digest dietary:

a. GLYCOGEN.

B. Dextrin.

c. Saccharose.

d. Cellulose.

20. The salivary amylase:

a. Is also called ptyalin and it is beta amylase.

B. Is the only amylase in GIT.

c. Digest mainly cooked starch.

d. Is activated by either HCL or ca++

21. During the chewing of a bolus of food, but before Swallowing, salivary secretion ,gastric secretion and pancreatic secretion are stimulated by which the following?

a. Acetylecholine,gastrin,histamine.

B. Acetylecholine,CCK,nitric oxide.

c. Nitric oxide,VIP, histamine.

d. VIP, gastrin,Somatostatin.

22. Thesalivary secretion:

a. Is rich in glucose.

B. Is Produced by a nervous mechanism Only.

c. digests starch to glucose.

d. Has the largest volume relative to other digestive juices.

23. About salivary glands, which of the following statement is true?

a. T heir secretion is mainly under hormonal control.

B. The sym . system is the Only natural pathway for stimulatation of their secretion.

c. Both sympathetic and parasympathetic nerves stimulate t heir secretion.

d. Bradykinin decrease their blood flow rate.

24. The saliva (true or false)?

a. Contains no organic substances.

B. Is markedly increase in amount after sympathetic stimulatation.

c. secretion is increased after injection of atropine.

d. secreted by submandibular glands is about 70%of the total secretion .

25. The presentation of a bolus of solid food to the mouth:

a. stimulates taste buds.

B. Is usually followed by Mastication.

c. Reflexively stimulates The salivary glands.

d. All are correct.

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