AP Biology Nervous Systems Part 3.

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AP Biology Nervous Systems Part 3

Synapse and Neurotransmitter

Nerve Impulse is approaching the axon terminal by Saltatory Conduction Schwann cell Depolarized region (node of Ranvier) Cell body Myelin sheath Axon

Synapse at the axon terminal Postsynaptic cell Presynaptic cell Na+ Neuro- transmitter Synaptic vesicles containing neurotransmitter K+ Presynaptic membrane Postsynaptic membrane Ligand- gated ion channel Voltage-gated Ca2+ channel Postsynaptic membrane Ca2+ Synaptic cleft Ligand-gated ion channels

Post synaptic membrane K+ Rising phase of the action potential K+ Falling phase of the action potential +50 Action potential Na+ Na+ Membrane potential (mV) –50 Threshold K+ Resting potential –100 Depolarization Time Na+ Na+ Extracellular fluid Potassium channel Activation gates Na+ K+ Plasma membrane Undershoot Cytosol Sodium channel K+ Inactivation gate Resting state

Synapse with effector cell Spinal cord Motor unit 1 Motor unit 2 Synaptic terminals Nerve Motor neuron cell body Motor neuron axon Muscle Muscle fibers Tendon