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An action potential occurs where the membrane potential of a living cell first increases then decreases. This is a characteristic trait of many animal cells namely, neurons, muscle cells and hormone-producing cells. Some plant cells also make them. Neurons play a significant part in cell-to cell communication. Pancreas beta cells have beta cells. action potential is linked to an insulin release. Plasma membranes feature a unique type of voltage-gated channels for producing action potential. The channels remain closed once the membrane's voltage is near an equilibrium potential for the cell but when the membrane's potential is increased it opens the channels. Once the channels are open, they permit an inward flow sodium ions. This in turn increases your membrane's potential. The rapid inward flow sodium ions leads to a change in the membrane's polarity and they disappear. Following this, potassium channels become active and they are able to flow outward of sodium ions. Due to this, the membrane is returned back to its original position. A transient , negative shift known as refractory period prevents back moving of the action-potential. In animal cells generally two types of potentials are acknowledged, one of which is via voltage-gated channels and another one that occurs due to voltage-gated calcium channels.

Nearly all cells keep a voltage difference between their outside and indoor environment. The cell's voltage is measured in milli volts (mV). The typical voltage of an animal cell is about -70 mV. The majority of cells show little voltage fluctuations are known to occur but in some cells this is a usual feature. Some cells also display an up-and-down cycle as they increase and decrease in voltage. The duration of these voltages can vary widely. In brain cells, the up and down cycle of the action potential is executed in less then a thousandth of a second, whereas in other cells, these cycles can take up to a few seconds. The electrical property of an animal cell depends on the membrane structure. Cell membranes consist of layers of lipids, and proteins. The lipid layer functions as an insulator.

All animal cells are electrically polarized due to an electric charge that is called membrane potential. In case of neurons, axons, dendrites and cells' bodies possess distinct electrical properties. The most stimulated part of an neuron is its axon hillock, however, axons as well as cells body too can be stimulated. At the axon hillock the resting potential is -70mV and the threshold potential is at -55 MV. Synaptic inputs to the neuron cause depolarization, which causes the membrane potential to rise or fall. Action potentials are produced when enough depolarization is accumulated and the membrane potential reaches the threshold.

Action potential is the result that voltage-gated ion channels which are located within the plasma membranes of cells. A voltage-gated ion canal is actually a group composed of proteins that remain in the plasma membrane. It generates action potential as it may create a positive feedback loop. Membrane potential is the main factor responsible for maintaining the state of the ion channels. The action potential is created whenever the positive feedback runs at full speed. The time and amplitude are dependent on the bio-physical properties of the voltage-gated ionchannels. Numerous types of ion-channels are recognized that create positive feedback loops and eventually result in the production of these potentials. Voltage-gated sodium channels are involved in the generation of larger impulses like nerve impulses. Lesser ones, such as those created by muscle cells are mediated by calcium Ion channels.The most researched voltage-gated Ion channels are sodium ion networks that play an important role in faster nerve impulse communication.

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