Why the transimission of nerve impulse from nodes or Ranevir is considered as faster mode of conduction?
Dear student,
Nodes of Ranvier is the region on axons which are rich in ion channels. The exchange of ions results in generation of action potential which helps in depolarisation of neuron and thus conduction of impulses. In myelinated neuron only nodes of Ranvier are exposed to extracellular space while the remaining portion of axon is covered with myelin sheath where conduction do not occur. So, in myelinated neuron saltatory conduction occurs where action potential jumps from one nodes of Ranvier to another. Therefore nodes of Ranvier is considered faster modes of conduction because the process of depolarising whole axon is not taking place and only nodes of Ranvier is getting depolarised leading to faster conduction.
Regards
Nodes of Ranvier is the region on axons which are rich in ion channels. The exchange of ions results in generation of action potential which helps in depolarisation of neuron and thus conduction of impulses. In myelinated neuron only nodes of Ranvier are exposed to extracellular space while the remaining portion of axon is covered with myelin sheath where conduction do not occur. So, in myelinated neuron saltatory conduction occurs where action potential jumps from one nodes of Ranvier to another. Therefore nodes of Ranvier is considered faster modes of conduction because the process of depolarising whole axon is not taking place and only nodes of Ranvier is getting depolarised leading to faster conduction.
Regards