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A process called an action potential happens where the potential for the membrane of a living cell first increases and then decreases. It is a common characteristic and characteristic of a lot of animal cells namely, muscles, neurons and endocrin cells. Certain plant cells also produce these. Neurons play a very crucial part in cell-to cell communication. The beta cells of the pancreas action potentials are connected to in the production of insulin. Plasma membranes feature a unique type of ion channels with voltage-gated voltages for producing action potential. These channels are shut as long as the potential of the membrane is within its resting capacity of the cell . However, when the membrane potential rises and the channels begin to open, they become active. The channels that are active allow an inward flow sodium ions that increase their membrane voltage. The rapid flow inward of sodium ions affects the polarity of the membrane and in turn, they disappear. Following this, potassium channels become activated and that is followed by an outward flow of the potassium ions . As a result, the membrane is returned back to its original position. A transient negative shift referred to as refractory time prevents the back moving of the action-potential. In animal cells , two kinds of these potentials can be described, for instance, one which is triggered through voltage-gated sodium channels and the other which is produced due to calcium channels that are voltage-gated.

Nearly all cells keep some degree of voltage variation between their exterior and interior environments. The voltage of the cell is measured in millivolts (mV). The typical voltage of an animal cell is -70mV. Most cells have low voltage variations are thought as occurring, however in certain cells this is a usual characteristic. Some cells also show up and down cycles as the voltage changes. The duration of these potentials are variable across a variety of. In brain cells, the up and down phase of an action potential are completed in a fraction of a millisecond of a second, whereas in other cells, intervals may be prolonged to several seconds. The electrical characteristic of a cell in the animal kingdom is dependent 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 . They maintain an electrical voltage that is called membrane potential. For the neurons, dendrites and cell body have different electrical characteristics. Most excitable portion of a neuron is the axon hillock, but the axon and the cell body also get excited. At the axon hillock the resting potential is 70 mV and the threshold potential is -55 MV. Synaptic inputs to the neuron induce depolarization and cause the membrane potential to increase or decrease. Action potentials are produced when enough depolarization accumulates and the membrane current reaches a threshold value.

Action potential is the result by the action of voltage-gated channels found within the plasma membrane of cells. A voltage-gated , ion channel is actually a cluster of proteins that remains embedded in the plasma membrane. This produces action potential because it can generate an positive feedback loop. Membrane potential is the main factor responsible for controlling the level of ion channels. The action potential is created as the feedback loop occurs at full strength. The duration and the amplitude are determined by the biophysical properties of the ion channel voltage-gated. Several types of ion channels exist that can generate positive feedback and produce these potentials. Voltage-gated sodium channel are involved in the creation of more powerful possibles that resemble those produced by nerve impulse. More slow ones such as those produced in the muscle cells are controlled by the calcium Ion channels.The the most intensely studied voltage-gated channel are sodium ion channels which are involved in the faster conduction of nerve impulses.

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