Science // Biology // B1 // Nervous system // Part 2 //

HideShow resource information
View mindmap
  • Nervous system
    • The central nervous system is the brain and spinal cord.
      • Once the information hits the central nervous system, there is a choice of two things
        • Reflex action
          • The message may be passed straight to a motor neurone via a relay neurone, this is a quick process.
            • Reflex actions are fast, they protect the body and they do not need conscious thought.
              • All reflex actions involve the brain, the pupil reflex govia the brain for example.
                • Reflex actions
        • Voluntary action
          • The message can be sent to the higher centres of the brain and the organism might decide to make a response.
            • Vountary actions ned a conscious decision in order to take place. They therefore always involve the brain.
    • Reflex arc
      • The reflex arc does not require a conscious action, which might be too slow
        • A reflex arc is the subconscious movement from a stimulus that can cause harm e.g bee sting.
        • The cerebral hemisphere is the area of the brain where the decisions are made. Nerve impulses from here are sent down the spinal cord to effectors via the motor neurones.


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Nervous system, hormones and behaviour resources »