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Post 2 in the Crash Course series on how the nervous system works: Action Potential! Neurons are extraordinary cells. Voltage is a difference in electrical charge. The greater the charge difference, the greater the membrane potential. In neurons, currents refer to the flow of positive or negative ions across cell membranes. Your body is separated from the outside world by skin. This allows the internal state of your body to have different conditions than the outside world. It has ion gates — macromolecules made of many proteins — that change shape when specific molecules are present, allowing other specific ions charged particles to pass through the cell membrane. The movement of these ions changes the charge of the cell, causing a cascade of activity. When neurons are at rest and not receiving electrical signal.
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This file is fae Wikimedia Commons n micht be uised bi ither waurks. The descreeption oan its file descreeption page thaur is shawn ablo. Gif the file haes bin modeefied fae its oreeginal state, some details micht na fullie reflect the modeefied file. Frae Wikipedia, the free beuk o knawledge. Ootline Descreeption Action Potential. This is depolarization. This creates a change in polarity between the outside of the cell and the inside. The impulse continuously travels down the axon in one direction only, through the axon terminal and to other neurons.
Another concept to be discussed is the refractory period. By definition, the refractory period is a period of time during which a cell is incapable of repeating an action potential. In terms of action potentials, it refers to the amount of time it takes for an excitable membrane to be ready to respond to a second stimulus once it returns to a resting state.