Neurones and nerve impulses in 3D
Switch between a myelinated and an unmyelinated neurone and watch the impulse travel to the synapse, where neurotransmitter crosses the gap.
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Questions students ask
Why does myelin speed up nerve impulses?
The myelin sheath insulates the axon, so the impulse jumps between the gaps (nodes of Ranvier) instead of travelling along every part of the membrane.
How does an impulse cross a synapse?
Neurotransmitter is released, diffuses across the gap and binds to receptors on the next neurone, starting a new impulse.
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