BIOL 103 Lecture Notes - Lecture 4: Glycolipid, Neuromuscular Junction, Multiple Sclerosis

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Two organ systems for maintaining internal coordination. Collection of cell bodies outside the cns. Sensory - signal from receptor to cns. Motor - signal from cns to effectors (muscles, glands) Support cells: protect and aide neuron function. Nerve cell (neuron) - carry out system communication. Conductivity (conduct electrical signal along plasma membrane) Long-lives (100+ years = neurons never die, stay with you forever) However, there are some undifferentiated stem cells in cns that can produce new neurons. But if the neuron is damaged, it cannot be fixed. 60% of brain is composed of lipids. Only in cns, 90% of neurons in the body. Compartmentalized rer (dark stains within neuron = rough endoplasmic reticulum) Type of nerve tissue - neuroglia (glial cells) Oligodendrocyte (fetus looking egg aka sac part) Ependymal cells (makes cerebrospinal fluid - plasm goes through to make the fluid)

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