Digestion Set 6

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This set of Digestion Multiple Choice Questions & Answers (MCQs) focuses on Digestion Set 6

Q1 | Bile secretion contains the following constituents except:
  • Bile salts.
  • Cholesterol.
  • Free bilirubin.
  • Urobilinogen.
Answer: Free bilirubin.
Q2 | Bile secretion is stimulated by the following except:
  • Secretion.
  • Bile salts.
  • Sympathetic stimulation.
  • increase blood flow of liver.
Answer: Sympathetic stimulation.
Q3 | Bile salts promotes lipid absorption as a result of all the followings except:
  • Emulsifying fat.
  • Formation of micelles.
  • Activation of pancreatic lipase.
  • Non of the above.
Answer: Non of the above.
Q4 | The following statements about absorption of bile salts are true except:
  • Active transport occurs in the distal ileum.
  • Removal of distal ileum reduces their absorption.
  • Passive diffusion transport of them.
  • none
Answer: Passive diffusion transport of them.
Q5 | Emptying of gall bladder is stimulated by the followings except:
  • Vagal stimulation.
  • Sympathetic stimulation.
  • CCK
  • none
Answer: Sympathetic stimulation.
Q6 | The following statements are correct about functions of gall bladder except:
  • The capacity of gall bladder is 20-60 ml.
  • Bile can be concentrated in gall bladder upto 12-20 folds.
  • Secretion of NaHCO3 by gall bladder prevents precipitation of calcium.
  • none
Answer: Secretion of NaHCO3 by gall bladder prevents precipitation of calcium.
Q7 | Select the single correct answer about bile pigments:
  • The principal bile pigment is bilivirdin.
  • Free bilirubin is the conjugated bilirubin.
  • Cholebilirubin is the conjugated bilirubin.
  • Urobilinogen is converted into bilirubin by action of bacteria.
Answer: Cholebilirubin is the conjugated bilirubin.
Q8 | All the following statements about bile pigments are true except:
  • They are formed from Hb in RECs.
  • In blood bilirubin combines with plasma albumin to form conjugated bilirubin.
  • Mostly urobilinogen passes with feces as stercobilinogen.
  • none
Answer: In blood bilirubin combines with plasma albumin to form conjugated bilirubin.
Q9 | Contraction of gallbladder is described by the following statement except:
  • Occur in response to CCK.
  • It is stimulated mainly by acid chyme in duodenum.
  • It is inhibited by atropine.
  • none
Answer: It is stimulated mainly by acid chyme in duodenum.
Q10 | All the following are correct statements about liver cells except:
  • They convert amino acids into glucose.
  • They form cholesterol.
  • They release glucose when blood glucose tend to decrease.
  • They are the only site of synthesis of plasma globulins.
Answer: They are the only site of synthesis of plasma globulins.
Q11 | The following statements about bile salts are true except:
  • They help digestion and absorption of fat.
  • They have choleretic action.
  • They are actively absorbed from duodenum.
  • none
Answer: They are actively absorbed from duodenum.
Q12 | Choose a single incorrect answer about bile salts:
  • Bile salts are secreted as conjugated bile salts by liver.
  • They are converted to 2ry bile salts by action of intestinal bacteria.
  • They help absorption of calcium and iron.
  • Non of the above.
Answer: Non of the above.
Q13 | Emptying of GB is inhibited by the followings except:
  • Somatostatin.
  • Sympathetic stimulation.
  • Estrogen.
  • Progesterone.
Answer: Estrogen.
Q14 | The following statements about succus entericus are true except:
  • It contains digestive enzymes.
  • Its secretion depends on the amount of chime in small hntestine.
  • It is secreted by intestinal glands.
  • It is released mainly by vagal stimulation.
Answer: It is released mainly by vagal stimulation.
Q15 | Succus entericus is inhibited by the followings except:
  • Adrenaline and noradrenaline.
  • Sympathetic stimulation.
  • Prostaglandins
  • endogenous opiates.
Answer: Prostaglandins
Q16 | Intestinal proteolysis is caused by the followings except:
  • Trypsin.
  • Carboxypeptidase.
  • Chymotrypsin.
  • Pepsin.
Answer: Pepsin.
Q17 | The intestinal brush border help digestion by the followings except:
  • Facilitating movements of intestinal content.
  • Supplying digestive enzymes and special transport system.
  • Increasing surface area of intestinal mucosa
  • none
Answer: Facilitating movements of intestinal content.
Q18 | Cholera toxins cause diarrhea by:
  • Activation of calcium activated C1 – channels in the cells of intestinal crypts.
  • Activation of cAMP-activated C1- channels.
  • Activation of both Ca++ activated and cAMP- activated C1- channels.
  • none
Answer: Activation of cAMP-activated C1- channels.
Q19 | The volume of succus entericus per day is about:
  • 0.6L.
  • 2L.
  • 3L.
  • none
Answer: 2L.
Q20 | Digestion of proteins by succus entericus enzymes includes all the following enzymes except:
  • Aminopeptidase.
  • Carboxypeptidase.
  • Nucleases.
  • Dipeptidase.
Answer: Nucleases.
Q21 | Lactase enzyme splits lactose into:
  • Glucose.
  • Glucose and galactose.
  • Glucose and fructose.
  • none
Answer: Glucose and galactose.
Q22 | Enteric lipase splits neutral fat into:
  • Fatty acid and glycerol.
  • Fatty acid glycerol and monoglycerides.
  • Monoglycerides.
  • none
Answer: Fatty acid glycerol and monoglycerides.
Q23 | The main mechamism of succus entericus secretion is:
  • Vagal stimulation.
  • CCK.
  • Secretin
  • Local axon reflex
Answer: Local axon reflex
Q24 | The extracellular enzyme in succus entericus is:
  • Dipeptidase.
  • Entericlipase.
  • Lactase.
  • Enterokinase.
Answer: Enterokinase.
Q25 | The followings are true statements about absorption from small intestine except:
  • Fructose is absorbed by facilitated diffusion.
  • Glucose is absorbed by Na+ dependent 2ry active transport.
  • Vit. B12 is absorbed by diffusion
  • none
Answer: Vit. B12 is absorbed by diffusion
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