Assertion Reason Test: Digestion & Absorption

10 Questions MCQ Test | Assertion Reason Test: Digestion & Absorption

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A: Gastrectomy causes iron deficiency anaemia.

R: Hydrochloric acid secreted by oxyntic cells converts ferric into ferrous and iron is absorbed as ferrous ions.

Solution: Gastrectomy is the surgical removal of the stomach.


A: Cholagogues are substances that cause contraction of gallbladder.

R: These substances cause the release of CCK-PZ from the duodenum.

Solution: Cholagogues increase the secretion of bile juice.


A: Aptyalism patients have higher than normal incidences of dental caries.

R: Aptyalism is caused by the action of a parasympathetic nervous system.

Solution: Aptyalism is a condition in which no saliva is produced, so there will be no lysozyme with anti-microbial activity and prevents the person from dental caries.


A: In humans, the duct of wirsung from pancreas combines with bile duct before opening into duodenum.

R: Blockage in the duct of Wirsung will prevent the endocrine function of pancreas.

Solution: Blockage of the duct of Wirsung will prevent exocrine function of pancreas.


A: In acute constipation, purgatives containing magnesium salts are generally used.

R: The osmotic effect of Mg2+ in the intestinal lumen prevents water reabsorption from the intestine. Mg2+ increases the solute concentration in the intestinal lumen because Mg2+ is absorbed very slowly.

Solution: Purgatives are used for the treatment of acute constipation.


A: Liver assists in the digestion of fat.

R: Hepatic secretion contains bile salts which emulsify fat

Solution: Livre secretes bile juice.


A: Vomiting is the forcible expulsion of the contents of the upper gastrointestinal tract through the mouth.

R: The strongest stimuli for vomiting are irritation and distension of the stomach.

Solution: Both assertion and reason are true, but the reason is not the correct explanation of the assertion.


A: Gastric emptying is slowest after a fat-laden meal containing a large number of triglycerides.

R: Fatty acids in chyme stimulate the release of both CCK and GIP, which slow stomach emptying.

Solution: GIP (Gastric Inhibitory Peptide) and CCK (Cholecystokinin).


A: Trypsin is secreted in pancreatic juice as trypsinogen.

R: Zymogenic forms protect the pancreas from autodigestion.

Solution: Trypsinogen is an inactive form of trypsin.


A: Trypsin is an example of endopeptidase and is present in the pancreatic juice.

R: Trypsin acts on the interior peptide of a protein molecule.

Solution: Pepsin, trypsin and chymotrypsin are endopeptidase enzymes.

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