MSF EXAM PRACTICE QUESTIONS WITH VERIFIED CORRECT ANSWER

MSF EXAM PRACTICE QUESTIONS WITH VERIFIED CORRECT ANSWER 1. Select the correct statement. a) The parotid gland contributes about 20% of the total saliva volume. b) The sublingual gland's secretion is mostly serous. c) Saliva contains a protease. d) There are hundreds of tiny salivary glands in the oral mucosa. - ANSWER not b 2. Which of the following is a purpose of cholecystokinin? a) Stimulation of gall bladder contractions. b) Stimulation of pancreatic enzyme release. c) Stimulation of stomach to empty. d) All of the former are correct. e) Both A and B are correct. - ANSWER e 3. Which organ of the GI tract has a layer of smooth muscle that none of the other organs has? a) Colon b) Small intestine c) Esophagus d) Stomach - ANSWER d 4. Lacteals... a) are found within each microvillus in the small intestine. b) are capillaries of the small intestine mucosa. c) absorb lipids and cholesterol into the lymph system. d) synthesize chylomicrons. - ANSWER c 5. Absence of a portion of the enteric nervous system in the small intestine could lead to... a) a gastrin-producing tumor and intestinal ulceration. b) intestinal ischemia. c) malabsorption due to improper digestion. d) intestinal obstruction and constipation. - ANSWER d 6. The interstitial cells of Cajal... a) periodically partially depolarize myenteric smooth muscle. b) periodically stimulate contractions of myenteric smooth muscle. c) periodically partially depolarize submucosal smooth muscle. d) periodically stimulate contractions of submucosal smooth muscle. - ANSWER a 7. Which of the following will increase the rate at which the stomach empties? a) Extreme distension. b) Rhythmic segmentation in the duodenum. c) Orad region is not very full. d) Presence of fat in the chyme in the duodenum. - ANSWER c 8. Select the correct statement. a) Somatostatin is universally stimulatory to digestive processes. b) Gastric Inhibitory Peptide is a gut hormone that stimulates insulin release. c) Saliva contains an enzyme that can begin protein digestion. d) The esophagus contains skeletal muscle, but not smooth muscle. - ANSWER b 9. The esophagus has sphincters at both ends because... a) average intraesophageal pressure is lower than intrathoracic pressure. b) average intraesophageal pressure is lower than atmospheric and abdominal pressure. c) average intraesophageal pressure is higher than abdominal pressure. d) None of the former is correct. - ANSWER b 10. Smooth muscle fibers... a) allow cytoplasm to stream from cell to cell due to gap junctions. b) have the same ratio of actin to myosin as skeletal muscle. c) are larger than skeletal muscle fibers. d) utilize calcium ions during relaxation. - ANSWER a 11. Which of the following substances would inhibit stomach acid secretion? a) Gastrin b) Histamine c) Acetylcholine (ACh) d) Prostaglandins - ANSWER d 12. Isotonic liquids empty from the stomach faster than hypotonic ones, and proteins empty faster than fat. a) True b) False - ANSWER a 13. The main component of feces is... a) bacteria. b) fiber. c) stercobilin and/or urobilin. d) water. - ANSWER d 14. The reason that peristalsis can produce smooth muscle contraction at the oral end while simultaneously producing smooth muscle relaxation at the aboral end is that... a) smooth muscle cells respond differently to the same neurotransmitter, based on their function and location. b) the sensory neuron in the GI mucosa that detects stretch produces two different neurotransmitters. c) the interneurons that convey impulses from the sensory neuron to the smooth muscle each produce different neurotransmitters, one stimulatory, one inhibitory. d) there is no stimulus to relax, only a stimulus to contract. - ANSWER c 15. Select the correct statement. a) Migrating myoelectric complexes begin occurring shortly after a meal. b) Migrating myoelectric complexes help keep bacteria out of the small intestine. c) Migrating myoelectric complexes occur about every fifteen minutes. d) All three of the former statements are correct. - ANSWER b 16. Consider a person that has had a severe bout of vomiting over several hours or days. Which of the following is a possible physiological consequence? a) Hypokalemia b) Hyperchloremia c) Respiratory acidosis d) Na+ secretion by kidney tubules - ANSWER a 17. When saliva is flowing at a relatively low rate,... a) the saliva is lower in K+ than plasma is. b) the saliva is lower in bicarbonate than plasma is. c) the saliva is higher in Na+ than plasma is. d) None of the former is correct. - ANSWER d 18. Select the incorrect statement. a) Intrinsic factor is made by chief cells. b) Intrinsic factor maximizes intestinal absorption of cobalamin