MCQ Physiology Answer 26

Correct Answer is A

Giant migrating contractions are strong, long-lasting contractions of circular smooth muscle that propagate for extended distances in small intestine and probably serve to eliminate noxious substances. A giant migrating contraction is much larger than the MMC or segmenting contractions. Giant migrating contractions strip the lumen clean as it travels at a rate of 1 cm/sec.

Vinegar on the mucosa, parasites, enterotoxins, and ionizing radiation are all stimuli that will stimulate the brain to transmit a giant migrating contraction, which occurs orthograde when exposed to a noxious substance and retrogade during emesis.



Giant migrating contractions are associated with abdominal cramping and diarrhea.

Category: Physiology MCQs