Homeostasis

• What is homeostasis

  Maintaining a stable internal environment
• why do conditions inside the body need to be kept steady

  cells and enzymes need the right conditions
• maintaining a stable internal environment in response to …

  change in internal and external conditions
• what do automatic control systems do

  regulate internal environment
• what 3 components are automatic control systems made of

  receptors

  coordination centres

  effectors
• what is negative feedback

  when the level of something is too high or low negative feedback brings it back to normal
• how does negative feedback decrease the level of something

  -receptor detects a stimulus (level is too high)

  -coordination centre receives and processes the information then organises a response

  -effector produces a response which counteracts the change and restores the level (the level decreases)
• how does negative feedback increase the level of something

  -receptor detects a stimulus (level is too low)

  -coordination centre receives and processes the information then organises a response

  -effector produces a response and restores the optimum level (level increases)