bio4.25 - Synpse Site of comm btwn the synaptic teminal...

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Synpse • Presynaptic cell • Post Synaptic cell Neuron Signaling • Neurons create electrical signals • Resting potential -Inactive neurons • Stimulation -Changes potential across membrane -More negative lose positive -Less negative (positive) positive charge going into cytoplasm -Threshold • Action potential -Signal conducted by axons -Rapid change from negative to positive potential Sodium channels open up to allow sodium in the cell to give positive charge Potassium channels open up and potassium leaves, making the charge negative Transduction phase of signaling Comm at Synapse • Action potentials stop at synaptic terminals • Preynaptic neuron • Neurotransmitters • Postsynaptic neuron •Postsynaptic potential -Change in the membrane potential of postsynaptic cell • Excitatory postsynaptic potentials -Less negative -More likely to produce action potential •I nhibitory postsynaptic potentials -More negative -Less likely to produce action potential * Summation -Cell body "adds up" PSPs -Is sum total above threshold?
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bio4.25 - Synpse Site of comm btwn the synaptic teminal...

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