PSYC 271 Study Guide - Midterm Guide: Resting Potential, Microelectrode, Membrane Potential
6 Feb 2018
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Intracellularly electrodes are called microelectrodes; extremely ne recording electrodes which are used for intracellular recording. This is when it is polarized (there is an electrical difference between the outside and the inside of the cell) More na+ outside in extracellular uid, less k+ More k+ inside the intracellular uid, less na+ Pressure on na+ to enter the resting neurons: 2 types of of pressure. Wednesday, november 1, 2017: electrostatic pressure: opposite charges attract, the -70 mv charge attracts the positively charged. Na+ ions into resting neurons: random motion: Na+ ions to move down their concentration gradient. Sodium ion channels in resting neurons are closed - greatly reduced the ow of na+ ions into the neutron. Potassium channels are open in resting neurons, but only few k+ ions exit bc they are largely held inside by the negative resting membrane potential. Very few na+ ions manage to enter resting neurons despite closed sodium channels and some k+ ions do exit.
