A: Gastrectomy causes iron deficiency anaemia.
R: Hydrochloric acid secreted by oxyntic cells converts ferric into ferrous and iron is absorbed as ferrous ions.
A: Cholagogues are substances that cause contraction of gallbladder.
R: These substances cause the release of CCK-PZ from the duodenum.
A: Aptyalism patients have higher than normal incidences of dental caries.
R: Aptyalism is caused by the action of a parasympathetic nervous system.
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.
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.
A: Liver assists in the digestion of fat.
R: Hepatic secretion contains bile salts which emulsify fat
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.
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.
A: Trypsin is secreted in pancreatic juice as trypsinogen.
R: Zymogenic forms protect the pancreas from autodigestion.
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.