After a large meal, neural signals from the gastrointestinal (GI) tract signal to the brain that the tract is distended and full. The GI tract also releases the hormones insulin and cholecystokinin (CCK) into the bloodstream that act to suppress hunger. Which of the systems of the body are involved in these processes?
endocrine, nervous, and immune systems
endocrine and nervous systems
digestive, nervous, endocrine, and circulatory systems
digestive, circulatory, and immune systems
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