Big Head Action Figures

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Action potential is a phenomenon where the potential for the membrane of a particular cell increases but then decreases. It is a characteristic property to a variety of human cells, which include muscles, neurons, and endocrin cells. Certain plant cells also produce these. Neurons play a very crucial role in cell-tocell communications. In pancreas beta cells, action potentials are linked with production of insulin. Plasma membranes have a specific type of voltage-gated Ion channels producing action potential. These channels remain closed as long as the potential of the membrane is near it's resting value of the cell , but should the membrane potential increase it becomes active. As the channels become open, they allow for an inward flow sodium ions that boost your membrane's potential. The rapid flow of sodium ions changes the polarity of the membrane and consequently they turn off. In the following, potassium channels become activated and it is a flow potassium ions . As a result, the membrane is returned to its original state. A transient negative shift , also known as refractory period blocks back running of the action kinetic. In animal cells generally , two types of these potentials exist, in existence, one that is caused due to voltage-gated sodium channels, and the second one that results from voltage-gated calcium channels.

The majority of cells exhibit the voltage of the outside and inside. The voltage of the cell is measured in milli volts (mV). The typical voltage of an animal cell is around -70 mV. In most cells, few voltage fluctuations are believed to occur , however in certain cells this may be a common feature. Some cells show up and down cycles as the voltage changes. The duration of these voltages can vary widely. In brain cells the up and down process of action possible are performed in less than a thousandth of a second. In other cells, the intervals may be prolonged to several seconds. The electrical ability of an animal cell is dependent on its membrane structure. Cell membrane is made up of layers of lipids and proteins. The lipid layer functions as an insulation.

All animal cells are electrically polarized and maintain an electric charge that is known as membrane potential. In case of neurons, axonsand dendrites and cell body have different electrical characteristics. The most excitable component of a neuron is the axon hillock but axon and cell body too can be stimulated. The axon hillock's resting potential is -70mV and the threshold potential is 55 millivolts. Synaptic signals to the neuron result in depolarization causing the membrane potential to increase or decrease. Action potential is created when enough depolarization happens and the membrane potential exceeds an upper limit.

Action potential is the result on the activities of voltage-gated channels that reside in the plasma membrane of a cell. The voltage-gated channel is in fact a collection of proteins , which are encased in the plasma membrane. It generates action potential because it can give rise to the positive feedback loop. Membrane potential is the main factor responsible for maintaining the state of the ion channels. Action potential is generated during the time that the feedback cycle proceeds with full intensity. The time and the intensity are determined by the biophysical properties of the ion channels that are voltage-gated. Different types of ion channels have been discovered that cause positive feedback processes that cause the creation of these potentials. These sodium channels are involved in the production of high-speed potentials that mimic those of nerve impulse. In contrast, the slower ones produced in the muscles cells are controlled by calcium ion channels.The most researched voltage-gated ion channels are the sodium-ion channels that contribute to more rapid nerve impulse conduction.

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