homeostasis

• what is homeostasis?

  maintaining a stable internal environment
• what do receptors do?

  Detect stimuli
• what does the coordination centre do?

  receives and processes information then organises a responce
• what does a effector do?

  produces a responce
• what does the central nervous system consist of?

  brain and spinal cord
• what do motor neurones do?

  carry electrical impulses from the central nervous system to the effectors
• what do sensory neurones do?

  carry information as electrical impulses from the receptors to the central nervous system
• the order of the CNS response

  stimulus -> receptor -> sensory neurone -> CNS -> motor neurone -> effector -> response
• what connects 2 neurones?

  the synapse
• nerve signals transferred by chemicals diffuse across the gap (synapse) to set off a new electrical signal n the next neurone
• example of a reflex

  bee stings finger -> stimulation of pain receptors -> impulses travel along a sensory neurone -> impulses are passed along a relay neurone via a synapse -> impulses travel along a motor neurone via a synapse -> when the impulses reach muscle, it contracts