Accommodation Property Of Nerve Fibre
Relative refractory period is due to the opening ok K + gates with Na + gates resting their usual state. Due to free flow of K +, stronger than usual stimulus is necessary to initiate action potential. Relative refractory period in axons experimented was 2-4 m s. The refractory period governs the rate at which a membrane can fire. Accomodation Strength of the stimulus applied bears relationship with length of the time of its application to produce a response. Short duration, strong stimuli and long duration weak stimuli fail to produce a response. Rate of rise of stimuli when applied rapidly produces better response. But slow rise in stimuli for longer duration fail to provoke a response due to adaptation by nerves to weaker stimuli which is known as accommodation. This phenomenon is due to partial inactivation of sodium carrier by nerve cell. Last modified: Thursday, 26 May 2011, 5:42 AM
Accommodation property of nerve fibre processing
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Accommodation property of nerve fibre cells
Above we see a myelinated neuron. If the myelinated cells are wrapped around interneurons, they are oligodendrocytes. If they're wrapped around neurons in the PNS they're called Schwaan cells. In either case there are these gaps called Nodes of Ranvier. The only place these potassium or sodium ions can enter or leave are from these spaces that are unmyelinated. Sodiums come in and potassiums going out just like a an unmymelinated nerve fiber, except this signal seems to jump from one node to the next. This is called saltatory conduction. It has nothing to do with salt but it comes from the latin word saltaire which means to jump or leap. Due to this skipping, saltatory conduction is up to 50 times faster than conduction through the fastest unmyelinated axons because they don't have to travel throughout every single space before moving to the next. So in essence, the action potential is generated only at the nodes. The cell membrane below the myelin sheaths hardly have any sodium channels and are therefore not excitable anyway.