PSYB64H3 Chapter 9: Psyb64 Chapter 9
Document Summary
Homeostasis and motivation: homeostasis: a physiological state of equilibrium of balance, coined by walter cannon, set points: a value that is defended by regulatory systems, such as a core temperature or a body weight. In infants: stimulating greater metabolic activity in brown fat cells. Output from the cold-sensitive neurons to the pvn and the posterior hypothalamus results in activation of the sympathetic nervous system: temperature-insensitive neurons make up about 60 percent of the poa, posterior hypothalamus. Interstitial fluid: a type of extracellular fluid surrounding the bodies cells: 26% of the bodys total water, extracellular fluid, higher concentration of sodium and chloride. Isotonic: having the same concentration of solutes as a reference solution. Iv usually have isotonic solutions containing sugars and sodium. Osmosis: osmosis: the movement of water to equalize concentration on two sides of a membrane, moves water from lower to higher concentration. Claude bernard (1856) provided more direct evidence against the dry-mouth theory.
