ANP 1105 Lecture Notes - Lecture 3: Positive Feedback, Cranial Nerves, Codocyte
14 Nov 2018
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Document Summary
The maintenance of relatively stable internal conditions despite continuous changes in environment. A dynamic state of equilibrium, always readjusting as needed. Variables are regulated so that internal conditions remain stable and relatively constant. Variables are factors that can change (blood sugar, body temp, blood volume) Responds to stimuli (things that cause changes in controlled variables) sends info (a erent pathway) to control centre. Receives input from receptor and determines appropriate response. Provides means for response (output along e erent pathways) Response either reduces stimulus (negative feedback) or enhances stimulus (positive feedback) Response reduces or shuts o original stimulus. Variable changes in opposite direction of initial change. Regulation of body temperature or regulation of blood glucose. Response enhances or exaggerates the original stimulus. May exhibit a cascade or amplifying e ect as feedback causes variable to continue in same direction as initial change. Usually controls infrequent events that do not require continuous adjustment for example:
