PSYC 211 Lecture Notes - Lecture 4: Semipermeable Membrane, Extracellular Fluid, Axon Terminal
16 Mar 2017
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Document Summary
This records activity of the neuron at the tip, it is un-insulated and it records the activity inside the neuron and then: the oscilloscope, a sensitive voltmeter, turns electrical fluctuations into visible signals. Membrane potentials the difference in the charge between the inside of the axon and the extracellular fluid is the membrane potential the neurons resting potential is when the steady membrane potential is -70mv, unless it is stimulated. The inside of the axon is negative in its resting state, the neuron is polarized. We can stimulate the neuron by passing a positive charge through another microelectrode. This changes the value of the membrane potential (towards 0). Depolarized when becoming more positive and peaks at +30mv. Hyperpolarized when it is more negative than -70mv. A rapid reversal of the membrane potential (reversal of the charge) (i. e. the inside of the membrane becomes positive).
