Seven Steps of a Chemical Synapse

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Step 7

impulse propgation

Step 1

nerve impulse arrive at end bulb

Step 4

neurotransmitter released into synaptic cleft and diffuse

Step 3

triggers exocytosis of synaptic vesicles with neurotransmitter

When a depolarizing graded potential makes the membrane depolarize to threshold..

voltage-gated sodium channels open rapidly

____ are examples of effectors of nervous system (clicker)

-glands

Step 5

bind to receptors on postsynaptic neuron and opens ligand-gated channels

Step 6

creates postsynaptic potential, which generates action potential if threshold

Step 2

depolarization opens voltage-gated calcium channels, calcium flows into axon terminal


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