Intro to psych ch 12.docx

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University of New Hampshire
Rebecca Nappa

Intro to psych Chapter 12 Motivation and emotion Motivation states Homeostasis: the bodys tendency to maintain the conditions of its internal environment by various forms of self regulation. Drive: a term referring to a state of internal bodily tension, such as hunger or thirst or the need for sleep. Thermoregulation Thermoregulation: the process by which organisms maintain a constant body temperature. Hunger, eating, and obesity Physiological aspects of hunger and eating Set point: a general term for the level at which negative feedback tries to maintain stability. The role of the liver Other control signals for feeding Glucoreceptors: receptors in the brain, that detect the amount of glucose in the bloodstream. Leptin: a chemical produced by the adipose cells that seem to signal that plenty of fat is stored and that no more fat is needed. This signal may diminish eating. Neuropeptide Y NPY: a chemical found widely in the brain and periphery. In the brain, it acts as a neurotransmitter; when administered at sites in and near the hypothalamus, it is a potent elicitor of eating. Hypothalmic control centers Dual center theory: the hypothesis that one area in the lateral hypothalamus is the on center; the initiator of eating, while another area is the ventromedial hypothalamus is the off center, the terminate of eating, although these brain regions are crucial for eating, the regulation of eating also involves other circuits. Obesity Body mass index BMI : the commonly used measure of whether someone is at a healthy weight or not; BMI is calculate as weight in kilograms divided by the square height in meters. Morbid obesity: the level of obesity at which someones health is genuinely at risk, usually defined as a BMI over 40. Comparative method: a research method in which on makes systematic comparisions among different species in order to gain insights into the function of a particular structure or behavior, or the evolutionary origins of that structure or behavior. Estrus: in mammals, the period in the cycle when the female is sexually receptive/ Human sexual response cycle: a sequence of four stages that characterizes the sexual response in both men and women: excitement, plateau, orgasm, and resolution. Hierarchy of needs: the theory that
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