PHIS 206 1st EditionLecture 1Outline of Current Lecture Introduction/HomeostasisI. PhysiologyII. HistoryIII. HomeostasisCurrent LectureI. Physiology: all of the stuff that stops when you die- Organism is still anatomically attached-Heart stops beating, no breathing, etc…II. History-William Harvey: discovered that blood circulates in the 17th century Invented the idea that if you want to see why something happens, then you need to observe the organism Take an organism, perturb the organism, observe, and deduce what happensIII. Homeostasis: maintaining constancy-Homeostatic mechanisms: things that maintain homeostasis EX.) Thermostato 94 degrees HYPOTHERMICo 105 degrees LETHAL-Rate at which we produce heat varies tremendously Muscles generate heat when you exercise. We moisturize to maintain our lostheat.-Feedback system: various ways to maintain heat; this system communicates with our brain that we lost heat so it can respond 2 Types:1. Negative feedback (virtually everything living): opposite directiono EX.) Temp. goes up 1 F, then it will go down 1 F 2. Positive feedback (pathological): same directiono “Vicious” cycle; few physiological cycles fall into this categoryo Destabilizing by natureo Cannot go on forevero EX.) Temp. goes up 1 F, then it will go up 1 F again These notes represent a detailed interpretation of the professor’ s lecture. GradeBuddy is best used as a supplement to your own notes, not as a
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