Contraction of the gallbladder is caused by:

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(C) The contraction of the gallbladder is primarily stimulated by the hormone $Cholecystokinin$ $(CCK)$.$CCK$ is secreted by the $I$-cells in the muco

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Cholecystokinin

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(C) The contraction of the gallbladder is primarily stimulated by the hormone $Cholecystokinin$ $(CCK)$.$CCK$ is secreted by the $I$-cells in the mucosal epithelium of the small intestine (duodenum and jejunum) in response to the presence of fats and proteins in the chyme.Once released into the bloodstream, $CCK$ acts on the gallbladder to cause its contraction, which forces bile into the common bile duct and eventually into the duodenum to aid in the digestion and absorption of fats.

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