Do you remember??? Synapse Small empty space between 2 neurons Between the synaptic knob and dendrite.

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Presentation transcript:

Do you remember??? Synapse Small empty space between 2 neurons Between the synaptic knob and dendrite

Overview Impulses must cross synapse to reach next neuron Uses chemicals Neurotransmitters Stored in vesicles within synaptic knobs

In Synaptic Knob Impulse reaches synaptic knob Synaptic vesicles move toward pre-synaptic membrane (on synaptic knob) Fuse with membrane using exocytosis

In Synapse Neurotransmitters Released from synaptic vesicles into synapse Diffuse across synapse Toward dendrite of adjacent neuron

Adjacent Neuron Neurotransmitters bind to a receptor site on post –synaptic membrane (on dendrite) Sodium channels open Impulse continues down neuron NOTE: A stronger stimulus causes impulses to arrive faster so more neuron transmitters are released

Back in Synapse Unused neurotransmitter must be removed from synapse Either: Re-enters synaptic knob Removed by enzyme

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