What is the most important stimulus for contraction of the gallbladder?
A) CCK causes contraction of the gallbladder.
B) Mechanical contraction of the small intestine causes bile to be forced out of the gallbladder.
C) Sympathetic stimulation causes contraction of the gallbladder.
D) An increase in bile secretion by the liver causes contraction of the gallbladder.

Question

Quizplus · Accepted Answer

The most important stimulus for contraction of the gallbladder is the hormone cholecystokinin (CCK), which is released by the small intestine in response to the presence of fat and protein. CCK signals the gallbladder to contract, causing bile to be released into the small intestine to aid in the digestion and absorption of fats. The other choices are not the primary stimulus for gallbladder contraction: mechanical contraction of the small intestine may stimulate the release of bile, but it is not the primary stimulus for gallbladder contraction; sympathetic stimulation is not a significant stimulus for gallbladder contraction; an increase in bile secretion by the liver does not directly cause the gallbladder to contract.

What Is the Most Important Stimulus for Contraction of the Gallbladder