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The oversight committees, particularly the HPSCI, became increasingly alarmed over the role US intelligence agencies were playing in the implementation of the administration's Central American policy. The issue of greatest concern was the CIA's support to the Contra rebels in Nicaragua.
The role of the parasympathetic nervous system is not clear. There is no evidence that hepatic secretion of bile salts is under neural control. The tone of the gallbladder and sphincter of Oddi regulates the amount of bile that actually enters the duodenum. CCK is the only known physiologic cholecystokinetic gastrointestinal hormone.