nervous system

• CNS: Central Nervous System, consists of the brain and spinal cord.
• PNS: Peripheral Nervous System, consists of all the nerves in the body.
• Axon carries impulses away from cell body.
• Dendrite receives impulses from other neurones.
• Myelin sheath is a fatty layer which provides electrical insulation.
• Sensory neurones carry electrical impulses from receptor to CNS.
• Motor neurone carry nerve impulses from CNS to effectors.
• Relay neurone link other neurones together.
• Neurotransmitter is a chemical which carries impulses through the synaptic gap.
• Synapse is a point where 2 neurones meet.
• Electrical impulses don’t travel down a whole axon, but they jump from one node to the next.
• Sensory neurones are long and have a cell body branching off the middle of the axon.
• Receptors detect stimuli and send signals to the CNS.