PSY2061 Study Guide - Final Guide: Resting Potential, Depolarization, Membrane Potential
4 Aug 2018
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Document Summary
How to record a membrane potential (l. o 1) Position tips of the electrode at both sides, the one outside the neuron in extracellular liquid. Intracellular tip (microelectrodes) has to be fine enough to piece it but not damage it. In resting neurons there is more na+ ions outside and more. Na+ ion channels are closed, so it reduces the flow of na+ ions into the neuron, only k+ ion channels are open in resting neurons, but k+ ions are held inside by the negative resting membrane potentials. When neurotransmitters bind to postsynaptic receptors, they usually have depolarize (decrease resting potential) or hyperpolarize (increase resting potential) Post synaptic depolarizations are called excitatory potentials (esps) because they are likely to cause neurons to fire. Post synaptic hyperpolarisations are called inhibitory postsynaptic potentials (isps) because they decrease the likelihood that neurons will fire.
