PSYB64H3 Lecture Notes - Lecture 3: Sodium Channel, Fluid Compartments, Extracellular Fluid
Document Summary
Lect 3 & 4- cells of the ns. Glia: primary supporting cells of the cns. Neurons: primary functioning cells of the cns, information processing and communication. Through their close association w the blood supply, astrocytes help transfer nutrients to neurons and block the movement of some circulating toxin into neural tissue like suction cups that grab on to cells, blood vessels. Each oli sends out branches that form myelin on an avg of 15 diff axons. One myelin segment from only 1 cell. Membrane is a bi-layer composed largely of phospholipids & other lipids studded w proteins & other large molecules. Allow ions to diffuse down concentration gradient selective permeability to certain ions: can be closed/open. Actively move ions against concentration gradient: move ions against their concentration gradients create ion concentration gradients req energy. 3 fiber types compose the cytoskeleton of neurons.
