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This set of Digestion Multiple Choice Questions & Answers (MCQs) focuses on Digestion Set 2
Q1 | The salivary secretion (true or false)?
- Has a serous component.
- Has a mucous component.
- A and B are correct.
- It is largely under hormonal control.
Q2 | The salivary secretion:
- Is stimulated by most GIT hormones specially gastrin.
- I s essential for complete digestion of starch.
- Increases more by sweet than by bitter substances.
- Markedly Increases by parasympathetic stimulatation.
Q3 | Salivation can become a conditioned reflex .This suggests that:
- Pleasant taste sensation are not related to the reflex .
- Only salivatory nuclei in the brainstem need to be excited by taste sensation without participation of suprasegmental influences.
- The cerebral cortex partially controls salivation.
- salivation could be completely interrupted in a decorticate animal whose tongue is mechanically stimulated.
Q4 | Saliva is characterized by all the following except:
- Its concentration of K+ is the same as that in plasma.
- Its Na+&Clconcentration are lower than those in plasma.
- Its osmotic pressure and PH are lower than their corresponding values in plasma.
- It exerts antibacterial action.
Q5 | which of the following statements about salivary secretion is untrue?
- saliva contains digestive enzymes.
- saliva has important antiseptic action.
- It is largely under hormonal control.
- none
Q6 | which of the following statements about salivary secretion is untrue?
- ) saliva has constant composition regardless the rate of secretion.
- The submandibular glands secrets about 70%of the total secretion .
- The buccal phase of salivary secretion is due to unconditioned reflex.
- none
Q7 | The pharyngeal phase of Swallowing:
- Can be voluntairly inhibited.
- Involves closure of larynx by the vocal cord.
- Is associated with lowering of the soft palate.
- Is accompanied by deep inspiration.
Q8 | The act of Swallowing is associated with:
- Concurrent inhibition of respiration.
- Opening of the glottis.
- Movement of food into the nasopharynx.
- upper esophageal sphincter constriction when food placed in contact with the anterior pillars of the pharynx.
Q9 | during which stage of Swallowing is respiration inhibited?
- Voluntary stage.
- pharyngeal stage.
- Esophageal stage.
- Postprandial stage.
Q10 | Deglutition (Swallowing):
- Is a complicated act requiring the precise coordination of many muscle group.
- Is an automatic function of smooth muscle.
- Is associated with a lowering of hard palate to prevent reflux of food into the nasopharynx.
- Does not require relaxation of cricopharyngeal muscle.
Q11 | During a normal Swallowing sequences ,the smooth muscle which surrounds the gastro esophageal junction.
- Remains tonically constricted until the bolus arrives at this junction.
- Relaxes even before the oncoming peristaltic wave has arrived.
- constricts further on the passing bolus and allows a gradual esophageal emptying.
- Is never constrict at all , and has no participation of any kind in the Swallowing process.
Q12 | Select a single incorrect answer about Swallowing:
- Reflex apnea occurs during the pharyngeal phase.
- the buccal phase of swallowing is voluntary.
- Food is prevented from entering the nose during swallowing by elevation of epiglottis.
- none
Q13 | Esophageal peristalsis:
- Is stimulated by A.CH.
- Is initiated by vagal reflexs.
- Can be caused by distension of the esophagus.
- All are correct.
Q14 | The musculature of the esophagus below the pharynx is:
- Smooth only.
- Mainly striated.
- Incapable of peristalsis in absence of impulses from the Swallowing center.
- Primarily innervated by spinal nerves.
Q15 | Secondary esophageal peristalsis:
- Is preceded by an oral- pharyngeal phase of Swallowing .
- Involves activation of medullary Swallowing centers .
- Is accompanied by lower esophageal sphincter relaxation.
- Occurs in both skeletal and smooth muscle portions of the esophagus.
Q16 | In contrast to Secondary esophageal peristalsis,primary esophagealperistalsis characterized by which of the following statements?
- It does not involve relaxation of The lower esophageal sphincter.
- It involves only contraction of esophageal smooth muscle.
- It is not influenced by intrinsic nervous system.
- It has an oropharyngeal phase.
Q17 | All the following statements about esophagus are true except:
- UES is a true sphincter.
- Gastrin increases tone of LES.
- LES contracts during Swallowing .
- none
Q18 | HCL secretion in the stomach:
- Is a function of peptic cells.
- Require no energy.
- Occurs by passive diffusion of both H+ and CLin the gastric human.
- Require presence of carbonic anhydrase enzyme.
Q19 | Gastric emptying:
- Is normally completed about 9 hours after ingestion of a usual meal.
- Is slowest if the food is soft and rich in carbohydrates.
- Is inhibited by excessive acidity in the duodenum.
- Is accelerated by presences of fat or hypertonic solutions in the duodenum.
Q20 | Acidification of the duodenum will:
- Decrease pancreatic secretion of bicarbonate.
- Increase secretion of gastric acid.
- Decrease gastric emptying.
- Increase contraction of the gall bladder.
Q21 | Oxyntic or parietal cells secrete:
- HCL.
- Trypsin.
- Zymogen granules.
- Pepsinogen.
Q22 | Ingesting antacids with and after a meal so that PH doesn`t decrease below 6 will cause a greater than normal secretion of:
- Gastrin.
- Secretin.
- Pancreatic bicarbonate.
- CCK.
Q23 | The pangs associated with hunger :
- Are decreased a low level of blood sugar.
- Are accompanied with feeling of hunger and pain in the pit of the stomach.
- Usually appear 3 to 4 hour after fasting begins.
- diminish after 1 to 2 days of starvation.
Q24 | Chronic gastritis is often associated with which of the following :
- Microcytic anemia.
- Hyperchlorohydria.
- Steatorrhea.
- pernicious anemia.
Q25 | Vitamin B12 absorption :
- Depends on presence of intrinsic factor.
- Depends on passive diffusion.
- Occurs in the jujenum.
- Occurs in the stomach.