Action Potentials.

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Nervous System Lecture (Day 2: How Nerve Impulses are Conducted)

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Presentation transcript:

Action Potentials

YouTube Nerve Impulse Animation

How does the electrical signal travel along the axon? Action Potential

Action Potential An Action potential is a electrical signal that moves down an axon away from the cell body

What happens when the impulse reaches the end of the neuron? The axon terminal ends at the synapse

Synapse Synapse - A structure that permits a neuron to pass an electro-chemical signal to an adjacent neuron.

What happens at the Synapse? The electrical activity is converted into the release of a chemical (neurotransmitter), which binds to receptors

YouTube Synapse

Propagation of the Nerve Impulse 1 2 3 Dendrites Cell Body Axon (Action Potential) Axon Terminal 4 7 6 5 Receptor Neurotransmitter Synapse

YouTube Action Potential Animation

YouTube The Schwann Cell and Action Potential

Stop Here

Action Potential Neuron is stimulated by another neuron or by the environment. Positively charged sodium ions flood in and the inside becomes temporarily more positive. As the impulse passes, potassium ions flood out restoring the resting potential.