SMLE (Saudi Medical Licensing) The Digestive System — practice questions
42 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice SMLE (Saudi Medical Licensing) The Digestive System in the app →Starting at the lumen and moving outwards, in what order do the four tissue layers of the alimentary canal appHow long is the alimentary canal in a living person?Which nerve plexus sits in the muscularis layer and sets the rhythm and force of its contractions?How does sympathetic activation change the behavior of the enteric neurons that serve the gut?Which group of digestive structures lies wholly or partly behind the peritoneum?The mouth, pharynx and esophagus have no serosa. What forms their outermost layer instead?Which one of these counts as one of the six processes of digestion?Where does segmentation mainly occur, and which muscle produces it?The duodenum releases secretin. What does secretin make the pancreas produce?Cholecystokinin is produced by the duodenum. Which pair of effects does it have?Which enzyme in saliva starts the breakdown of carbohydrates in the mouth?Bicarbonate and phosphate ions buffer saliva. What pH range do they hold it at?Lingual glands secrete lingual lipase into the mouth. Where does this enzyme actually begin working, and on whIn a full set of 32 permanent teeth, how many are molars?Which type of muscle makes up the muscularis in the lower third of the esophagus?During the pharyngeal phase of swallowing, where do impulses from receptors in the oropharynx travel?What are the four main regions of the stomach?Which two products do the parietal cells of the gastric glands make?Hydrochloric acid gives the stomach contents their high acidity. What pH range does it produce?Chief cells release pepsinogen rather than pepsin. What converts pepsinogen into pepsin?How often is the surface epithelium of the stomach completely replaced?Which single stomach function is necessary to life?How long does the gastric phase of gastric secretion last?Which three features of the small intestine wall enlarge its absorptive surface?Each villus holds a lymphatic capillary called a lacteal. What does the lacteal take up?Segmentation is fastest at the start of the small intestine. What rate does it reach in the duodenum?Intestinal glands produce intestinal juice. What is its pH, and is it acidic or alkaline?Which three features are unique to the large intestine?Which vitamins do the bacteria of the large intestine synthesize?Of every 500 mL of food residue that enters the cecum each day, how much becomes feces?What does the gallbladder do with the bile the liver makes?Bile is an alkaline solution. What pH range does it have?Bile salts are recycled rather than lost. Where are they reabsorbed so the liver can reuse them?Which brush border enzyme converts trypsinogen from the pancreas into active trypsin?Which component makes pancreatic juice slightly alkaline?Which three structures are the liver's three main components?Lactase acts on lactose. Which two monosaccharides does it release?What does pancreatic lipase leave behind after acting on one triglyceride?By which route do chylomicrons reach the bloodstream after leaving an intestinal epithelial cell?Glucose and galactose enter intestinal cells by co-transport with sodium. How does fructose enter?Vitamin B12 binds intrinsic factor. Where is the resulting complex taken up, and by what mechanism?About how much of the water reaching the small intestine is absorbed there?