KINE 3012 Lecture Notes - Hematocrit, Endocrine System, Homeostasis

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Intrinsic controls relate to intracellular, intercellular, and local levels: does not take into consideration other organs. Extrinsic controls relate to systems and organisms on a whole: accomplished by nervous and endocrine systems. The brain receives feedback and communicates through hormones and neurotransmitters. Maintaining a relatively stable internal environment: dynamically changing range of acceptable values it is adaptive, when you go to a higher altitude you have an increased hematocrit after a period of time. There is a hierarchy of importance that determines which variables have priority: dependant on the situation at hand (sacrificing peripheral warmth for core temperature in cold weather) Steady state is the normal range of values above/below the set point: requires energy to maintain. Error signal refers to a deviation from the set point (up and down fluctuations) Sensitivity of the detector determines the range of oscillation. Local homeostatic mechanisms do not involve an integrating centre.

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