31. Histamine a) Release is reduced by increased gastrin levels b) Stimulates se

Question

31.   Histamine

      a)       Release is reduced by increased gastrin levels

      b)       Stimulates secretion of H+ into the stomach

      c)      Decreases the release of pepsinogen

      d)      Stimulates contraction of the gallbladder

32. Chylomicrons?

      a)       Enter the lymphatic system through lacteals in the GI tract

      b)       First enter the circulation through capillary beds in the GI tract

      c)       Are acted on by skeletal muscles lipoprotein lipase (LPL) to yield fatty acids

      d)`      a and c are correct

33. Which one of the following statements is true?

      a)      Gastric inhibitory peptide (GIP) is decresed when glucose is                                                      present in the small intestine

      b)       Secretin stimulates release of bicarbonate by the liver

      c)      Cholecystokinin (CCK) stimulates gastric motility and secretion.

      d)       Motilin stimulates the Migration motor pattern

34. Which one of the following statements is correct?

      a)       To be effective enterokinase must be converted from an inactive to an active                         form.

      b)       The pancreas secretes acid to neutralize chyme that enters the                                                 small intestine.

      c)       Mucous cells secrete mucous and bicarbonate to prevent HCL from

                 damaging the stomach

      d)       The primary exocrine function of the pancreas is to secrete gastrin

35. Which of the following statements is correct?

      a)       Activation of parasympathetic nerves increases the frequency and strength of                       of contraction of smooth muscle in the small intestine                                        

      b)       Gastrin increase motility of the stomach and decreases motility of the small                            intestine

      c)       Nitric oxide (NO) causes contraction of contraction of smooth muscle in the                            small intestine

      d)       None of the above is correct

36. Which one of the following statements is correct?

      a)       The stomach, small intestine and large intestine absorb proteins and                                       carbohydrates.

      b)       Breakdown of carbohydrates occurs primarily in the stomach.

      c)       The stomach mixes the bolus of food into chyme, releases it into the small                             intestine for further digestion of proteins and carbohydrates.

      d)       Trigylcerides are broken into monogycerides and fatty acids which are                                    absorbed in the large intestine

37. The brush border enzyme _____ breaks down a disaccharide to yield glucose and                   fructose?

      a)       Lactase

      b)       Maltase

      c)       Sucrase

      d)       Fructase

38. The large intestine?

      a)       Has large surface area due to the presence of Villi and microvilli that allow                             rapid absorption of proteins and carbohydrates

      b)       Is not able to reabsorb water

      c)       Contain bacteria which produce folic acid and vitamin K

      d)       Contain bacteria that convert heme to bilirubin

39. Which of the following statements is correct?

      a)       Gastrin inhibits gastric motility

      b)       Gastrin secretion is inhibited when the pH of the stomach increases

                 above 3.

      c)       Gastrin secretion is increased by the presence of amino acids and peptides in              `         the stomach.

      d)       All the above are correct

40. The liver has multiple functions that include?

         a)    Bile production

         b)    Converting bilirubin to urobilinogen

         c)    Production of clotting factors

         d)    A and C are correct

         e)    All the above are correct

Explanation / Answer

Gastrin stimulate histamine and histamine stimulate secretion of acid .

Histamine and gastrin stimulate pepsinogen.

Hiatemine dies not cause gall bladder contraction.

So option B.

2 chyolmicrons are lipoproten that transport dietary lipidfrom intenstine to differant part of body.theyem enter lymphatic system thriugh lacteals and acted on by skeketal muscke lipopritein lipase to produce fatty acidd.

3gip secreted in hyperglycemic condition,secretin stimulate bicarbonate secretion in pancreas,chelecystokini cause digestion of fat..motilin stimulate migratory motor pattern so optoin D.

37 sucrase convert dusacchrides into glucose and fructise.

38.intenstine have villi and microvilli that increase surface area for digestion of protein and carbohydrate

40liver help in bike production and cloting factir prodyction but billirubin to urobillinogen occurs in large intenstineso option D

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