Nervous organisation: central nervous system made up of the brain and spinal cord, the peripheral system, made up of a pair of nerves either side of the brain or the spinal cord. Peripheral nervous system is divided into 2: sensory neurones (carry nerve impulses from receptors -> CNS) motor neurones (carry nerve impulses away from CNS -> effectors) Motor nervous system divided into 2: voluntary nervous system (nerve impulses --> mucsles under conscious control) Autonomic (carry nerve impulses to glands/cardiac muscle, under subconscious control)
The Spinal cord: a column of tissue runs alone the backs, emerging at intervals are nerves.
A reflex arc: Response to pulling hand away from fire= involuntary, by the time the brain has recieved the message, the muscles have pulled the hand away called a reflex: 1) Stimulus 2) receptor 3) sensory neurone 4) intermediate neurone 5) motor neurone 6) effector 7) response.
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