Physio 8 Exercise 10

Topics: Action potential, Neuron, Nervous system Pages: 2 (581 words) Published: February 20, 2013
Nerve and neuron sound similar to most people, but they are two different components of the body (Martini, 375). Nerves are found only in the peripheral nervous system, while neurons are found in the brain, spinal cord, and peripheral nerve (Martini, 375). Neurons are nerves cells that are specialized for intercellular communication (Martini, 375). A neuron is composed of a cell body, dendrites and axon (Marieb, 376). A nerve is a bundle of axons or dendrites that is wrapped in connective tissues (Martini, 376). The nerve transport impulse between the central nervous system and other parts of the body (Martini, 376). A Myelin sheath can be found in both nerves and neurons (Martini, 383). Myelin is an electrical insulation on the axon that increases the speed at which action potential travels along the axon (Martini, 381). Action potential is a change in the transmembrane potential of excitable cells initiated by a change in the membrane permeability to sodium ions (Martini, 376). An action potential in a neuron plasma membrane is a nerve impulse (Martini, 377). Action Potentials are circulated in the trans membrane potential that if started it affects the entire excitable membrane ( Martini,394). The sodium potassium pump maintains the difference in electrical charge found by the diffusion of ions (Marieb, 125). The resting membrane potential is the difference in electrical charge across the plasma membrane (Marieb, 125). The resting membrane potential can be measured with a voltmeter by putting a recording electrode inside the cell membrane (Marieb, 125). The process of moving sodium and potassium ions across the cell membrane is called active transport (Martini, 384). Active transport moves three sodium ions out of the cell while moving two potassium ions into the cell (Marieb, 125). A threshold stimulus occurs when a neuron is activated by a stimulus of adequate intensity causing the membrane to reach its trigger zone and becoming more permeable to sodium...
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