Deck 1: Gastrointestinal Hormones and Functions

Question 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-.

Answer 1

Increases the pancreatic Secretion of water and HCO3-.

Question 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.

Answer 2

Decreased gut motility.

Question 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

Answer 3

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

Question 4

Stimulation of sub mucosal plexus result in an Increase in which of the following?

A)motility of the gut.
B)Secretion of the gut.
C)sphincter tone.
D)stomach PH.

Question 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.

Question 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.

Question 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 .

Question 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.

Question 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.

Question 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.

Question 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.

Question 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 .

Question 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.

Question 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.

Question 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)

Question 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

Question 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.

Question 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.

Question 19

Man is unable to digest dietary:

A)GLYCOGEN.
B)Dextrin.
C)Saccharose.
D)Cellulose.

Question 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++

Question 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.

Question 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.

Question 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.

Question 24

The saliva ?

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 .

Question 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.