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• You’re going to watch a short video about multiple sclerosis. During the video, note down: – What do you see? – What does it make you think? – What does it make you wonder? http://www.youtube.com/watch?v=BfNU_FPDa98 We are learning about... The structure of neurones Neuronal transmission We are learning how to... Describe biopsychological processes We need to use... Reasoning Making links • The nervous system is made up of individual neurons. • Neurons are cells specialised for communication of electrical and chemical impulses. • Draw and label a neuron in as much detail as you can. A neuron Source: science photo library Neurons Neuronal cell bodies Axons Synapses occur at the junctions Neurons • Neurons come in three types: – Sensory neurons – Motor neurons – Inter-neurons • What do you think might be the differences between them? Types of neurons • Sensory • Motor • Inter (relay) • Carries information from sensory organs to CNS (through somatic system) • Carries information from CNS to muscles and glands (somatic & autonomic systems) • Connect neurons to other neurons (lots of these in the CNS) Neuronal transmission • Neurons transmit electrical signals called action potentials. • Action potentials work a bit like a ‘Mexican wave’. • The presence of a myelin sheath on a neuron changes the rate of transmission. • Multiple sclerosis is caused by a process called demyelination. – What do you think this might be? – How do you think it might cause MS symptoms? – Which divisions of the NS might be involved?