BSC-2010 Lecture Notes - Lecture 13: Neuroplasticity, Oligodendrocyte, Tryptophan

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Functional hierarchy of the vertebrate peripheral nervous system (pns) Internal and external stimuli > sensory receptors > a erent neurons > Autonomic nervous system - control of smooth muscles, cardiac muscles, glands. The main roles of the parasympathetic and sympathetic nerves in regulating internal body functions (autonomic nervous system) The insulation increases the speed at which action potential travels down an axon. The presence of schwann cells means that it is a myelinated neuron. Schwann cells are one type of glial cell that form a myelin sheath. The interior of the cell is negative relative to the exterior. This is critical for the excitable cells (your nerve cells and muscle cells) Membrane potentials: resting potential (selective permeability to k+) Your membranes are much more permeable to k+ then na+ due mv. Membrane potentials: depolarization when na+ channels open transiently. When open, ions di use down their electromechimcal gradient(s)

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