01:830:314 Lecture 2: Physiological Psychology (Chapter 2)
9 Oct 2018
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Document Summary
Structure and function of cells of the nervous system. Rough er : transmits and stores rna. Forms myelin sheath: speeds up action potential. Contains lipid bilayer that separate the outside from the neuron (fluid envrionment) Lipid molecules have a head and two tails: tails are hydrophobic and heads are more water friendly (layer is meant to keep water/ions out) Ions have concentration grade; about 10x more concentration on the outside of the cell (except potassium, which is the opposite) Ions are very hydrophilic, and cannot go through bilayer without a channel. This process controls the electrical activity of the neuron. Each ion channel is selective for one ion species. Ion channels are classified according to how they are gated (opened/closed): Voltage-gated : open or close as membrane potential changes. Neurotransmitter-gated : open or close when a neurotransmitter binds to its receptor: receptors : where a neurotransmitter binds (postsynaptic) One part of a receptor contains a binding site for:
