PSY290H5 Chapter 9: Chapter 9 Textbook Notes - Temperature Regulation, Thirst and Hunger

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19 Aug 2013
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Lo1: explain the terms homeostasis, set point, and motivation. Homeostasis a physiological state of equilibrium or balance. To achieve homeostasis, regulatory systems defend set points for variables such as temperature, fluid levels and weight: set point a value that is defended by regulatory systems, such as core temperature or a particular body weight. The process of motivation both activates and directs behaviour: motivation the process of activating and directing behaviour. When homeostasis is compromised, nervous system activates behaviour by producing tension in the form of drive states (ex. Thirst, hunger: drive states arise in response to physiological needs and go away when needs are met. Once organism is activated by a drive state, it will initiate behaviour to solve problem. Involves a precisely defined set point, mechanisms for detecting deviations away from set point, internal and behavioural elements designed to regain set point. Extreme temperatures limit life through their impact on the chemical properties of living cells.

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