Medical Physiology GIT MCQs

Question 1

Which substance will cause smooth muscle relaxation?

Accepted Answer

Secretin — Vasoactive Intestinal Peptide (VIP) is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 2

Which does not take part in the stimulation of GI glands?

Accepted Answer

External Stimulus — External Stimulus is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 3

Which of the following is the site of secretion of intrinsic factor?

Accepted Answer

Ileum — Gastric fundus is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 4

Which of the following changes occurs during defecation?

Accepted Answer

External anal sphincter is contracted — Internal anal sphincter is relaxed is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 5

Which of the following produce testosterone?

Accepted Answer

Interstitial cells of Leydig — Interstitial cells of Leydig is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 6

Which of the following does not occur on presentation of a bolus of solid food to the mouth?

Accepted Answer

Stimulation of taste buds — Stimulation of defecation reflex is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 7

The salivary secretion:

Accepted Answer

Is stimulated by most GIT hormones, especially gastrin — Is markedly increased by parasympathetic stimulation is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 8

Chronic gastritis is often associated with the following:

Accepted Answer

Microcytic anemia — Pernicious anemia is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 9

Vitamin B12 absorption:

Accepted Answer

Depends on passive diffusion — Depends on the presence of intrinsic factor is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 10

The cephalic phase of gastric secretion:

Accepted Answer

Occurs when food reaches the stomach — Is controlled by the vagus nerves is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 11

Gastric HCl secretion:

Accepted Answer

Is a passive process that occurs in all parts of the stomach — Plays a significant role in iron absorption is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 12

Distension of the stomach:

Accepted Answer

Is associated with a decrease in its peristaltic movement — Decreases the tone of the lower esophageal sphincter is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 13

Fructose is absorbed from the small intestine by:

Accepted Answer

Simple diffusion — Facilitated diffusion is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 14

Vitamin C is absorbed from the small intestine by:

Accepted Answer

Passive diffusion — Na⁺-dependent secondary active transport is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 15

Peristaltic rush is characterized by the following except:

Accepted Answer

They are strong peristaltic contractions — They occur normally is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 16

Small intestine motility is stimulated by the following except:

Accepted Answer

Gastrin — Secretin is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 17

Small intestine motility is inhibited by the following except:

Accepted Answer

Somatostatin — Insulin is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 18

Emptying at the ileocecal region is promoted by:

Accepted Answer

Distension of cecum — Distension of stomach is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 19

Emptying at the ileocecal region is inhibited by:

Accepted Answer

Gastroileal reflex — Colonoileal reflex is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 20

The first portion of the stomach that food enters is the:

Accepted Answer

Body — Cardia is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 21

Cholecystokinin from the intestinal wall is stimulated by the presence of:

Accepted Answer

Acid in the stomach — Fats and protein in the duodenum is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 22

Which of the following hormones stimulates the gallbladder to release bile?

Accepted Answer

Enterokinase — Cholecystokinin is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 23

Which of the following hormones stimulates the release of insulin from the pancreatic islet cells?

Accepted Answer

Enterocrinin — Gastric Inhibitory Peptide is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 24

During the defecation reflex, the:

Accepted Answer

Diaphragm is lowered — None of the above is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 25

Inhibition of the myenteric plexus leads to the following:

Accepted Answer

Increased secretion of secretin from the duodenum — Decreased gut motility is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 26

The secretion of gastrin ceases:

Accepted Answer

When the stomach is distended by a meal — When the pH of the gastric content is decreased below 2 is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 27

Stimulation of the submucosal plexus results in an increase of the following?

Accepted Answer

Motility of the gut — Secretion of the gut is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 28

Secretin:

Accepted Answer

Stimulates a pancreatic secretion rich in enzymes — Is released as a result of contact of acid chyme with the duodenal mucosa is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 29

About the GIT hormones affecting gastric function:

Accepted Answer

CCK and secretin increase both gastric secretion and motility — GIP and VIP inhibit gastric secretion is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 30

Cholecystokinin:

Accepted Answer

Is released from gastric mucosal cells — Release is stimulated by protein hydrolysates in the lumen of the small intestine is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 31

The major factor that stimulates the release of secretin into the bloodstream is:

Accepted Answer

The parasympathetic stimuli — An acid pH of the chyme entering the duodenum is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 32

Deficiency of adrenal cortex hormones results in:

Accepted Answer

Addison disease — Addison disease is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 33

Which of the following hormones promotes the excretion of potassium ions and the reabsorption of sodium ions?

Accepted Answer

Aldosterone — Aldosterone is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 34

Which of these is true of the endocrine system?

Accepted Answer

Secretes hormones that are transported to target cells by blood — All of the above is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 35

Actions of Luteinizing hormone in the male include:

Accepted Answer

Stimulating mitosis in spermatogonia — Initiating spermatogenesis by stimulating seminiferous tubule epithelial cells is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 36

For calcium metabolism, all of the following are required except:

Accepted Answer

Vitamin D — Thyroxine is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 37

All of the following are stimuli for growth hormone release except:

Accepted Answer

Hypoglycemia — Obesity is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 38

The endocrine gland responsible for the body's circadian rhythm is the:

Accepted Answer

Thymus gland — Pineal gland is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 39

A hormone involved in programming circadian rhythms:

Accepted Answer

Enkephalin — Melatonin is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 40

Vitamin B12 is absorbed via:

Accepted Answer

Simple diffusion — Endocytosis is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 41

Which is true regarding the adrenal hormones?

Accepted Answer

Cortisol is produced in response to elevated blood glucose — Adrenaline is produced in the adrenal medulla is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 42

Regarding thyroid hormones:

Accepted Answer

T3 is converted to T4 by deiodinase — T4 is converted to T3 by deiodinase is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 43

Which is true regarding cortisol?

Accepted Answer

Its production results in lowering of blood glucose — Its level is highest just before sunrise is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 44

Which is true regarding autocrine communication?

Accepted Answer

Signals transmitted via the bloodstream — Signals sent to the same cell that produced it or neighboring cells of the same type is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 45

Which is not true regarding insulin?

Accepted Answer

It is a peptide hormone — Its secretion is stimulated by somatostatin is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 46

Which is true regarding growth hormone?

Accepted Answer

Maximal secretion occurs during the day — Is secreted by the anterior pituitary is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 47

What is responsible for growth of internal organs after birth?

Accepted Answer

IGF-1 — IGF-1 is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 48

Autocrine communication refers to:

Accepted Answer

Signals transmitted via the bloodstream — Signals sent to the same cell that produced it or neighboring cells of the same type is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 49

Which is true regarding hormone transporters?

Accepted Answer

Dopamine is transported by them — They prolong the half-life of circulating hormones is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Question 50

Target cells are able to respond to specific hormones because:

Accepted Answer

They recognize the hormone-binding protein — They have receptors that are specific to the hormone is the physiologically correct answer per standard MBChB-level teaching on this topic. ---

Medical Physiology GIT MCQs

Questions, Answers & Explanations