Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. How is information transmitted in the nervous system?
   • Information from receptors passes along Cells (neurones) as electrical impulses to the central nervous system (CNS).
2. What is in the central nervous system?
   • The CNS is the brain and spinal cord.
3. What is the role of the central nervous system?
   • The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones.
4. What are the stages of the reflex arc?
   • The stages of the reflex arc are stimulus, receptor, sensory, relay, motor, effector then response.
5. How are the neurones adapted to their function?
   • Neurones axon allowing impulses to be transmitted long distances, they also have dendrites on the Cell body which are branched to detect impulses from other nerves. They are insulated with a myelin (fatty) sheath so that impulses do not cross over and they have a synapse to propagate the impulses using chemical messengers.
6. Why are reflex actions so important?
   • They allow us to respond to our environment and keep ourselves out of danger.
7. How are reflex actions described?
   • Reflex actions are automatic and rapid; they do not involve the conscious part of the brain.