Cell excitable
A cell excitable is a cell able to discharge a Potentiel from action in answer to a sufficient Dépolarisation (higher than some threshold of depolarization ) of sound Potentiel from membrane.
The capacity to discharge a potential from action depends on the proteinic composition on the cytoplasmic membrane, in particular of the presence of ionic channels whose opening is activated by a depolarization of the membrane. The sodic channels (but also channels calcic) allow a brutal depolarization of the membrane, while the potassic channels repolarisent all at once this one. The form of the potential of action depends on the types of ionic channels present in the membrane.
The discharge of the potential of action can be accompanied by release of second messenger in the cytoplasm and caused a series of seeing metabolic, as it is the case for the muscular Contraction or the neuronal Plasticité.
List cells excitables
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