Shaquille O Neal Action Figure

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Action potential is an event where the potential for the membrane of a living cell first increases but then decreases. It is the characteristic property to a variety of animal cells namely, muscles, neurons, and endocrinological cells. Plant cells can also produce these. Neurons play a very crucial role in cell-tocell communication. The beta cells of the pancreas actions potential is associated with that release of insulin. Plasma membranes are made up of a special kind in voltage-gated, ion-channels that are used for producing action potential. They remain closed even when their membrane potential is near the potential at rest of the cell but in the event that the membrane potential grows then the channels will become active. As the channels become open, they permit the inward flow of sodium ions. This increases that membrane's capacity. The rapid inward flow of sodium ions alters the polarity of the membrane and they stop functioning. The potassium channels then become activated , and the flow outward potassium ions . As a result, the membrane returns to its resting condition. The transient negative change known as refractory is a way to stop back traveling of the action voltage. In animal cells generally , two kinds of these voltages are described, for instance, one which is triggered by voltage-gated sodium channels and the second that is generated by calcium channels that are voltage-gated.

A majority of cells experience a voltage difference between their exterior and interior environments. The cell's voltage is measured in milli volts (mV). The typical voltage for an animal cell is about -70 mV. In the majority of cells, no voltage fluctuations are known to occur however in some cells this may be a common characteristic. Some cells exhibit upward and downward cycles as the voltage fluctuates. The time between these potentials can be varied over a broad spectrum. In brain cells the down and up sequence of action potentials are completed in a fraction of a millisecond of a second. In other types of cells the cycle may last for several seconds. The electrical property of a cell in the animal kingdom is dependent on the membrane structure. Cell membrane is comprised of layers of lipids and proteins. The lipid layer functions as an insulation.

Animal cells are all electro-polarized. They keep an electrical voltage that is called membrane potential. In case of dendrites, neurons, axons and the body of the cell have distinct electrical characteristics. One of the most exciting parts of an individual neuron is the hillock, but the axon and the cell body can also be excited. At the axon hillock the resting potential is 70 mV and the threshold potential is -55 millivolts. Synaptic stimulation to the neuron result in depolarization that causes the membrane potential to increase or decrease. Action potential is produced when enough depolarization happens and that membrane potential reaches a threshold value.

Action potential is the result of activity of voltage-gated ion channels that reside in the plasma membranes of cells. A voltage-gated Ion Channel is actually a cluster consisting of proteins that stay in plasma membrane and produces an action potential since it could cause positive feedback loop. Membrane power is responsible for control of the activity of ion channels. The action potential is created when the positive feedback cycle proceeds with full intensity. The time and amplitude are determined by the bio-physical properties of the voltage-gated ionchannels. Different types of ion channels are known that produce positive feedback cycles , which eventually produce these potentials. These sodium channels are involved in the creation of more powerful potentials similar to those generated by nerve impulses. More slow ones such as those produced by muscle cells are mediated by the calcium Ion channels.The the most intensely studied voltage-gated ion channels are the sodium ion channel that participate in the speedier nerve impulse conduction.

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