NERVE IMPULSE DEFINITION
The transmission of impulses through the neuron is called propagation or conduction of nerve impulses. The impulse transmission is by electrical potential and wave like.
The propagation of nerve impulse can be studied in four stages. These are
- Membrane Potential
- Action potential
In the resting stage of neuron, sodium ions move out from axoplasm. Where as potassium ions move from out side into the axoplasm. This movement of sodium and potassium is called 'Na - K' pump.
3. NERVE IMPULSE TRANSMISSION IN THE MYELINATED NEURON
4. SYNAPTIC TRANSMISSION
The tips of telodendrites of pre synaptic neuron contain acetyle choline secreting knobs. When the impulse reaches to the actyle choline knobs, the acetyle choline breaks from the knob and drops into the dendrite of post synaptic neuron. After the impulse passes the synapse, the acetyl choline is hydrolysed by an enzyme called choline esterase.