PHIS 206 1st Edition Lecture 1 Outline of Current Lecture Introduction Homeostasis I Physiology II History III Homeostasis Current Lecture I 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 happens III Homeostasis maintaining constancy Homeostatic mechanisms things that maintain homeostasis EX Thermostat o 94 degrees HYPOTHERMIC o 105 degrees LETHAL Rate at which we produce heat varies tremendously Muscles generate heat when you exercise We moisturize to maintain our lost heat 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 direction o EX Temp goes up 1 F then it will go down 1 F 2 Positive feedback pathological same direction o Vicious cycle few physiological cycles fall into this category o Destabilizing by nature o Cannot go on forever o 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 substitute
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