BIOL 3405 Study Guide - Midterm Guide: Internal Resistance, Demyelinating Disease, Negative Feedback
8 Oct 2015
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Nonneuronal cells provide physical support, regulate extracellular environment to maintain homeostasis, provide protection, have defensive roles, and produce myelin. Schwann cells & oligodendrocytes myelination, extracellular ionic regulation astrocytes, scavengers in response to brain injury microglia: neurons describe ramon y cajal"s major contributions (neuron doctrine, law of dynamic polarization) Neuron doctrine nervous system consists of separate independent nerve cells. Silver nitrate staining technique developed by golgi to visualize neurons. It consists of actin, intermediate filaments and microtubules. Actin is polar, forms a dense network at periphery of cells; it maintains cells" shape, growth, death, spatialized microdomain. Intermediate filaments stabilizes cell structure, most abundant in axon. Membrane separates intracellular and extracellular space, does not allow ions to flow through freely and acts as a capacitor for the signaling: explain the function of a capacitor. Ions move passively though channels, while they are actively pumped by pumps.
