HOMEOSTASIS

• Homeostasis 


  Maintance of the internal environment despite fluctuations in the internal or external environment
• Variables


  Measures of the body properties that may change in value
• Example of variables

  Body temperature

  Heart rate

  Bp

  Blood glucose level
• Normal range 


  Normal extent of increase or decrease around a set point
• Set point 


  Normal or average value of variable
• Negative feedback 


  Main mechanism used homeostatic regulation
• Negative feedback response involves

  Detection of deviation away from set point

  Correction reversal of deviation toward set point and normal range
• Components of feedback

  Receptor

  Control center

  Effector
• Receptor


  Detects changes in variable
• Control center 


  Recieves receptor signal establishes set point, send signal to effector
• Effector


  Directly causes change in variable
• Positive feedback


  Mechanism occur when the initial further stimulates the response