What is a generation of action potential?
Action potential is to change the relative charge through the membrane of some cells found in animals and plants. Cells that undergo action potentials are called excitative cells and include nerve cells, muscle cells and endocrine system cells - or hormones producing a system. Generating action potential is a process that causes a change of charge across the membrane.
There are four basic phases that are involved in the generation of action potential. When there is no action potential, the cell is reportedly in the resting phase phase. In the nerve cell there is a relative charge in the cell of about -70 Milivolt (MV) at this stage. The resting potential of the cell is maintained by charged ions found inside and around the cell. Nerve cells contain positive potassium ions in the cell membrane, while positive sodium ions and negative charged chloride ions are found outside the cell.
The levels of ions found and beyond the cell are controlled by ionic gates and pumps. During the calmPotassium ions are pumped into the cells and sodium ions are pumped into the cell. The concentration of these ions due to each other causes a charge over the membrane. At the moment, the cell is said to be polarized.
For the start of the action potential, the charge in the cell must be perverted. When the stimulus is applied to the cell, it can cause depolarization to be depolarized. Generating action potential needs a stimulus that meets or exceeds a certain level of threshold. If the threshold is not met, the action potential will not be generated. The size of the action potential is the same whether the threshold value is reached or exceeded, so the generation of action potential is called "all or no event".
During the depolarization, ion channels open so that the sodium ions rush the cell. This causes the cells to undergo retroactively. For nerve cells, the threshold is for generating action potencyIál hub +40 mv. This occurs in less than two milliseconds or two thousandths of a second. Once the action potential is created, the repolarization of this cell membrane area begins.
As soon as the action potential is triggered in one of these cell types, it is said to be self-promoting. This means that the action potential in one area of the membrane stimulates cells to start the process of generating action potential in the neighboring part of the membrane. As a result, the action potential moves along the length of the cell.