HTHSCI 1H06 Lecture Notes - Lecture 2: Homeostasis, Ovulation, Headache
16 Apr 2019
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Homeostasis: a relatively stable state of equilibrium or a tendency toward such a state between the different but interdependent elements or groups of elements of an organism, population, or group. Feedback system (loop): is a cycle of events in which the status of a body condition is monitored, evaluated, changed, remonitored, reevaluated, etc. Controlled condition: each monitored variable (body temperature, blood pressure, blood glucose level, etc. ) Stimulus: any disruption that changed a controlled condition. Receptor (detector): body structure that monitors change in a controlled condition and sends input to a control center. Control center: sets the range of values within which a controlled condition should be maintained (set point), evaluates the input receives from receptors, and generates output commands when they are needed. Effector: is a body structure that receives output from the control center and produces a response or effect that changes the controlled condition. Afferent pathways: carry nerve impulses into the cns.
