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The action potential is a process that occurs when the membrane potential of a living cell first increases before decreasing. It is a signature characteristic for a range of living cells, including muscle cells, neural cells, and cell types that are endocrine. Certain plant cells also produce them. Neurons play a vital role in cell-tocell communications. in pancreas beta cell action potential is associated with releases of insulin. Plasma membranes have a specific type of voltage-gated ion channel for producing action potential. The channels are closed whenever the membrane's potential remains close to an equilibrium potential for cells, however when the membrane's voltage increases then the channels are activated. Once the channels are open, they permit an inward flow of sodium ions which increases cell membrane power. The rapid inward flow of sodium ions changes the membrane's polarity and as a result they turn off. After that potassium channels become active and the flow outward of the potassium ions . The result is that the membrane returns back to its normal state. A transient negative shift , also known as refractory periods prevents back travelling of the action potential. In animal cells generally , two kinds of these voltages are described, for instance, one of which is due to voltage-gated sodium channels and another one that occurs due to calcium channels that are voltage-gated.

Nearly all cells maintain an electrical voltage gap between their exterior and interior environments. The voltage of the cell is measured in millivolts (mV). The typical voltage for an animal cell is -70 mV. The majority of cells show low voltage variations are thought to occur but in some cells, this is a standard characteristic. Some cells exhibit an up-and-down cycle as they increase and decrease in voltage. The time between these potentials fluctuate over a large range. In brain cells the down and up process of action possible are complete in less than the thousandth of a second. In other cells, the cycles could take several seconds. The electrical ability of a cell in the animal kingdom depends on the membrane structure. Cell membranes are composed of two layers of lipids and proteins. The lipid layer serves as an insulation.

All animal cells are electrically polarized and maintain the voltage differential known as membrane potential. For neurons, , dendrites and the cell body all have different electrical properties. The most excitable component of neuron is the Axon hillock, but the axon and the cell body too are excited. At the axon , the resting potential is 70 mV and the threshold potential is at -55 millivolts. Synaptic inputs to the neuron result in depolarization that causes the membrane potential to rise or decrease. Action potential is created when enough depolarization accumulates and the membrane potential is at an upper limit.

Action potential is the result from the voltage-gated channels located in the plasma membranes of cells. A voltage-gated Ion Channel is in fact a collection of proteins that remain embedded in the plasma membrane. It generates the action potential, which can be the cause of an positive feedback loop. Membrane voltage is responsible for setting the parameters of ion channels. The action potential is created during the time that the feedback cycle occurs at full strength. The duration and intensity are determined by the biophysical properties of the ion channel voltage-gated. There are a variety of ion channel types that have been discovered that cause positive feedback circuits that ultimately result in the production of these potentials. The sodium channels with voltage are involved in generation of faster possibles that resemble those produced by nerve impulses. They are slower than those that occur in muscle cells are controlled by calcium Ion channels.The most studied voltage-gated ion channels are the sodium ion channels which are involved in quicker nerve impulse conduction.

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