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Nerve Impulse is approaching the axon terminal by Saltatory Conduction Cell body Schwann cell Depolarized region (node of Ranvier) Myelin sheath Axon
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AP Biology
Nervous SystemsPart 3
Synapse and Neurotransmitter
Nerve Impulse is approaching the axon terminal by Saltatory Conduction
Cell body
Schwann cell
Depolarized region(node of Ranvier)
Myelinsheath
Axon
Synapse at the axon terminal
Postsynaptic cellPresynaptic cell
Synaptic vesiclescontainingneurotransmitter
Presynaptic membrane
Voltage-gatedCa2+ channel
Ca2+Postsynaptic membrane
Postsynaptic membrane
Neuro-transmitter
Ligand-gatedion channel
Na+
K+
Ligand-gatedion channels
Synaptic cleft
Post synaptic membrane
Resting potential
Threshold
Mem
bran
e po
tent
ial
(mV)
Actionpotential
Time–100
–50
+50
0
Potassiumchannel
Extracellular fluid
Plasma membrane
Na+
Resting state
Inactivationgate
Activationgates
Sodiumchannel K+
Cytosol
Na+
Depolarization
K+
Na+
Na+
Rising phase of the action potential
K+
Na+
Na+
Falling phase of the action potential
K+
Na+
Na+
Undershoot
K+
Na+
Synapse with effector cell Motor
unit 1Motorunit 2
Nerve
Synaptic terminals
Motor neuroncell body
Spinal cord
Motor neuronaxon
Muscle
Tendon
Muscle fibers
