Homeostasis intro

• what is homeostasis

  homeostasis is the regulation of internal conditions to maintain optimum conditions for bodily responses
• 4 main internal conditions that must be kept constant 


  Water levels

  Blood glucose concentration

  Body temperature

  Ion content
• How does a stimulus lead to a response being carried out by the body

  1. Stimulus is converted into an electrical impulse by the receptors
  2. The electrical impulse passes along sensory neurones to the CNS
  3. The CNS coordinates an appropriate response and an electrical impulse is sent along motor neurones to the effector, which carries out the response
• What are the types of effectors and what do they do

  Muscles contract when stimulated

  Glands release hormones