Homeostasis

• What are the two parts of the central nervous system?

  Spinal chord and brain
• What is a “receptor”

  -detect stimuli
• What is the coordination system?

  Receives and processes information from receptors around the body
• What are effectors?

  Bring about responses to the stimuli
• What is a stimulus

  Something which sets off the response
• What are the three types of neurone?

  Sensory,motor and relay
• What are some features all neurones have?

  Axon- insulated by a myelin sheath. They are long so they can carry messages up and down the body

  Dendrons- branch further as sentries at each end. These receive incoming impulses from other neuron’s
• What is the order of the reflex action?

  Stimulus

  Receptor

  Sensory neurone

  Relay neurone

  Motor neurone

  Effector

  Response
• What is the sensory neurones job in the reflex arc?

  Sends electrical impulses to relay neurone in the spinal cord.
• What is the job of the motor neurone in the reflex arc?

  Sends electrical impulses to an effector
• What is the job as the effector in the reflex arc?

  Produces a response (eg muscle contracts to move hand away)