Homeostatic Systems

• What do homeostatic systems do?


  detect a change and respond by negative feedback
• What do homeostatic systems involve?


  receptors, a communication system and effectors
• What do receptors do?


  Detect when a level is too high/low, and the information is communicated VIA THE NERVOUS SYSTEM OR THE HORMONAL SYSTEM TO EFFECTORS
• What do the effectors do?


  respond to counteract the change- bringing the level back to normal ?
• What is a negative feedback mechanism?


  The mechanism that restores the level back to normal
• What does negative feedback do?


  keeps things around the normal level

  (eg body temp usually kept within 0.5c +- 37)
• Negative feedback ONLY WORKS within what?


  within certain limits - if the change is too big then the effectors MAY NOT BE ABLE TO COUNTERACT IT

  • eg huge drop in body temp caused by prolonged exposure to the cold weather may be too large to counteract
• Control of body temp by negative feedback?


  • body detects temp is too high
  • effectors respond to decrease temp
  • body detect temp = too cold
  • effectors respond to increase temp
  • ??