1) An Enhibitory Post-synaptic Potential (EPSP) will be produced when a neurotransmitter opens a potassium channel closes a sodium channel closes a potassium channel opens a sodium channel 2) Synapses are most commonly formed between a(n) ________ and a(n) ________. dendrite; soma soma; axon terminal button; axon terminal button; dendrite
1)
An Enhibitory Post-synaptic Potential (EPSP) will be produced when a neurotransmitter
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opens a potassium channel |
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closes a sodium channel |
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closes a potassium channel |
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opens a sodium channel |
2)
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Synapses are most commonly formed between a(n) ________ and a(n) ________.
dendrite; soma
soma; axon
terminal button; axon
terminal button; dendrite
Excitatory post-synaptic potentials are post-synaptic potentials that are created by the opening of sodium channels to precipitate a depolarizing impulse. The equilibrium potential of the cell is -65 mV, and depolarization makes it more likely that an action potential will be triggered.
When sodium channels open, the positively charged Na+ ions enter the intracellular space and depolarize the cell membrane. Thus, the cell's membrane potential comes closer to 0 mV and becomes less negative, a process called depolarization.
Since the EPSP brings the membrane potential closer to the threshold of triggering an action potential, it makes firing an action potential by the neuron easy. Hence, the name excitatory post-synaptic potential.
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