BI236 Lecture Notes - Lecture 12: Central Nervous System, Myelin, Peripheral Nervous System

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4 Mar 2019
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Transduction mechanisms: electrical & synaptic signaling in neurons. The nervous system: almost all animals have a - nervous system in which impulses are transmitted along the specialized plasma membranes of nerve cells, vertebrates have, central nervous system (cns)- brain and spinal cord. 2. peripheral nervous system (pns)- other sensory or motor components. Membrane potential: cells at rest normally have excess negative charge on the inside and positive charge on the outside of the cell, the resulting electrical potential is called the resting membrane potential (vm) The resting membrane potential: vm develops because cytosol and extracellular fluid contain different compositions of cations and anions, extra cellular fluid, cytosol. Dissolved salts, mostly sodium chloride (na+, cl-) Potassium as its main cation due to the action of the na+/k+ pump. Causes potassium ion gradient, that will tend k+ ions to diffuse outside the cell: the vm of most animal cells is usually in the range of -60 to 75 mv.

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