Question 1

Small intestine motility is stimulated by the following except:&#10;A)Gastrin&#10;B)CCK&#10;C)Secretin&#10;D)Motilin.

Accepted Answer

Secretin primarily stimulates the pancreas to secrete bicarbonate-rich fluids to neutralize stomach acid entering the small intestine, rather than directly stimulating motility.

Question 2

Small intestine motility is inhibited by the following except:&#10;A)Somatostatin.&#10;B)VIP.&#10;C)Adrenaline&#10;D)Insulin.

Accepted Answer

Insulin does not inhibit small intestine motility; it primarily regulates glucose metabolism. Somatostatin, VIP, and adrenaline are known to inhibit intestinal motility.

Question 3

Motility of small intestine is inhibited by the following except:&#10;A)Intestino-intestinal reflex&#10;B)Vesico-intestinal reflex.&#10;C)Peritoneal irritation&#10;D)Distention of stomach.

Accepted Answer

Distention of the stomach actually stimulates motility in the small intestine through the gastrocolic reflex, rather than inhibiting it.

Question 4

Large intestinal secretion is stimulated by:&#10;A)Direct stimulation.&#10;B)Local myentric reflex.&#10;C)Para sympathetic stimulation.&#10;D)All of the above.

Accepted Answer

All of the above options are correct. Direct stimulation, local myenteric reflexes, and parasympathetic stimulation all play roles in stimulating large intestinal secretion.

Question 5

Colonic motility is stimulated by the following except:&#10;A)Gastro-colic reflex.&#10;B)Colono-colic reflex.&#10;C)Duodeno-colic reflex.&#10;D)none

Accepted Answer

The answer of Colonic motility is stimulated by the following...

Question 6

Emptying at ileocecal region is promoted by:&#10;A)Distenion of cecum&#10;B)Distention of colon.&#10;C)Distention of stomach.&#10;D)Sympathetic reflex.

Accepted Answer

Distention of the stomach promotes the emptying at the ileocecal region through the gastroileal reflex, which increases the force of ileal contractions and relaxes the ileocecal sphincter.

Question 7

Emptying at ileocecal region is inhibited by:&#10;A)Gastroileal reflex.&#10;B)Gastrin&#10;C)Colonoileal reflex.&#10;D)Distention of terminal ilium.

Accepted Answer

The colonoileal reflex inhibits emptying at the ileocecal region. This reflex is a physiological response where distension of the colon (particularly the ascending and transverse colon) triggers a decrease in ileal motility, thereby slowing the emptying of ileal contents into the cecum. This helps regulate the flow of contents into the colon, allowing for proper absorption and preventing overloading of the colon.

Question 8

Removal of the entire colon would be expected to cause:&#10;A)Megaloblstic anemia.&#10;B)Severe malnutrition.&#10;C)Decrease urinary urobilinogen.&#10;D)Death.

Accepted Answer

The colon is primarily involved in the absorption of water and electrolytes, not in the absorption of nutrients critical for preventing megaloblastic anemia or severe malnutrition. Removal of the colon would lead to a decrease in the conversion of bilirubin to urobilinogen by colonic bacteria, hence decreasing urinary urobilinogen. Death is not a direct and inevitable consequence of colon removal, as individuals can live without a colon, although they may require significant lifestyle adjustments.

Question 9

The parasympathetic supply of the distal colon is:&#10;A)Pelvic nerve.&#10;B)Vagus nerve&#10;C)The lesser splanchnic nerve.&#10;D)The pudendal nerve.

Accepted Answer

The parasympathetic supply of the distal colon is provided by the pelvic nerves (also known as the pelvic splanchnic nerves), which originate from the sacral spinal cord (S2-S4). These nerves carry parasympathetic fibers that stimulate peristalsis and glandular secretion in the distal colon.

Question 10

The external anal sphincter is supplied by:&#10;A)Pelvic nerve.&#10;B)Pudendal nerve.&#10;C)Vagus nerve&#10;D)none

Accepted Answer

The external anal sphincter is supplied by the pudendal nerve, which is responsible for its motor innervation.

Question 11

Large intestine secretion is stimulated by:&#10;A)Direct stimulation.&#10;B)Local .myentric reflex.&#10;C)Parasympathetic stimulation.&#10;D)All the above.

Accepted Answer

The answer of Large intestine secretion is stimulated by:&#10;A)Direct stimulation.&#10;B)Local...

Question 12

Mass movement in the colon after meal is due to the following except:&#10;A)Gastrocolic reflex&#10;B)Duodenocolic reflex&#10;C)Gastrin hormone.&#10;D)Secretine hormone.

Accepted Answer

The answer of Mass movement in the colon after meal...

Question 13

Mass movement in the colon would be abolished by:&#10;A)Vagotomy.&#10;B)Sympathectomy.&#10;C)Destruction of the intrinsic nerve plexus.&#10;D)none

Accepted Answer

The answer of Mass movement in the colon would be...

Question 14

The following are true about defecation except:&#10;A)It is initiated by distention of rectum with feces.&#10;B)It is facilitated by micturition reflex.&#10;C)It is under voluntary control in infant.&#10;D)It is inhibited by pain.

Accepted Answer

The answer of The following are true about defecation except:&#10;A)It...

Question 15

Anal mucosa is sensitive to all of the following except:&#10;A)Pain&#10;B)Stretch.&#10;C)Touch&#10;D)Temperature

Accepted Answer

The answer of Anal mucosa is sensitive to all of...

Question 16

Rectal mucosa is sensitive to:&#10;A)Pain&#10;B)Touch&#10;C)Temperature&#10;D)Stretch

Accepted Answer

The answer of Rectal mucosa is sensitive to:&#10;A)Pain&#10;B)Touch&#10;C)Temperature&#10;D)Stretch...

Question 17

Resting anal pressure is mainly due to :&#10;A)Tone of external anal sphincter&#10;B)Tone of the internal sphincter.&#10;C)Tone of the puborectalis muscle.&#10;D)none

Accepted Answer

The answer of Resting anal pressure is mainly due to...

Question 18

Fecal continence requires:&#10;A)Intact innervations of anorectal region&#10;B)Sensation of rectum and anal mucosa.&#10;C)Tone of the internal and external anal sphincter&#10;D)All of the above

Accepted Answer

The answer of Fecal continence requires:&#10;A)Intact innervations of anorectal region&#10;B)Sensation...

Deck 8: Digestive System Motility and Secretion