Intro to psych
Motivation and emotion
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
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
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
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