Distinguish between: (b) impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre
Impulse conduction through myelinated nerve fibers is Faster due to transmission (jumping or salutatory propagation) through the nodes of Ranvier Peripheral and central nervous systems neurons are all myelinated to facilitate faster impulse conduction. e.g.: impulse conduction during a reflex action takes place in the spinal cord by the myelinated nerve fibers Long nerve fibers are myelinated to enhance the rate of impulse conduction The myelin sheath preserves the impulse during impulse conduction by a myelinated nerve fiber. Impulse conduction through unmyelinated nerve fibers is Slower due to the absence of nodes of Ranvier. Impulse conduction by unmyelinated nerve fibers transmits signals for any secondary pain, irritation, etc. Shorter nerve fibers do not have myelin sheath and hence impulse conduction is slower.
