Empty stomachs contract, causing both hunger pangs and the secretion of chemical messages that travel to the brain to serve as a signal to initiate feeding behavior. This is an example of ________. Select one: a. a genetic disorder that results in persistent feelings of intense hunger and reduced rates of metabolism b. binge eating behavior that is followed by an attempt to compensate for the large amount of food consumed c. how physiological mechanisms serve as the basis for hunger d. the amount of energy that is expended in a given period of time.