PSYCH 1XX3 Chapter Notes - Chapter 3: Neurogenesis, Lactation, Electroencephalography
2 Jul 2015
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Voltage gated channel: important in the action potential: electrostatic force of the proteins keep most of the chloride ions outside the cell, sodium ions flow into the cell at very low concentrations due to the fact that the voltage gated sodium channels are closed at the resting potential. Neurotransmitters are found within small intracellular containers called vesicles in the terminal end of the presynaptic neuron: as the action potential reaches the terminal ends, some of the vesicles move towards the cell membrane of the presynaptic neuron, vesicle fuses with the membrane of the presynaptic membrane and spills the neurotransmitter into the synaptic cleft. During an epsp, sodium channels open allowing some positively charged sodium ions to flow into the postsynaptic cell: multiple epsps brings the neuron closer to the 50 mv threshold to fire, temporal summation: the slow climb towards the threshold, spatial summation: multiple epsps generated simultaneously making the same postsynaptic neuron, inhibiting the transmission of a signal.
