Which two hormones are released by the digestive system, and are involved in the regulation of hunger?
A) CCK and ghrelin
B) oxytocin and vasopressin
C) oxytocin and CCK
D) ghrelin and vasopressin
Answer: A
Rationale: Ghrelin is a hormone secreted in the stomach that stimulates stomach contractions and appetite. Another key chemical in regulating hunger is cholecystokinin (CCK). As the intestines expand, neurons release CCK, which communicates to the hypothalamus that it is time to stop eating.
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