Homeostasis and Negative Feedback

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  • Homeostasis and Negative Feedback
    • Conditions
      • Temp
      • glucose levels
      • salt conc.
      • water potential of blood
      • blood pressure
      • CO2 levels
    • Negative feedback
      • Optimum conditions
        • change away from optimum
          • receptor detects change
            • communications system detects error
              • effector reacts to reverse change
                • return to optimum conditions
      • sensory receptors
        • temperature receptors or glucose conc. receptors
        • monitor conditions
      • communications system
        • nervous or hormonal
        • transmits messages from receptors to effectors
      • Effector Cells
        • muscles cells or liver cells
        • reverse the change
      • Reversal of any change in conditions.
    • Positive feedback
      • increases any change detected by the receptors.
      • Body too cold
        • inactive enzymes
          • slower exergonic reactions
            • body cools further
      • cervix begins to stretch
        • signal to anterior pituitary gland
          • secretion of oxytocin
            • cervix stretches more
              • more oxytocin released.

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