similarities and differences between a nerve its nerve fibres and an electric cable?

Answer 1

The axons in a nerve are similar to the individual wires bundled together in a large electrical cable. The come from different sources, get bound together in one package for most of their journey, then branch apart at the end to reach their individual targets.

Electric cable conducts a current down its length. Nerves, on the other hand, operate by electrical potential and charge differences. There are different concentrations of sodium and potassium inside and outside the cell, resulting in a charge of -70mV across the membrane. When it comes time to fire, small channels in the cell membrane open up and the Na and K flow through, bringing the local charge to +40mV. This change causes the next channels down the axon to open up, repeating the process until the wave reaches the end of the axon. The result is a chain reaction, like setting off a row of dominoes.

It's more complicated than current in a wire, but the signal doesn't degrade, which is much more effective over the relatively long distances (from the point of view of a neuron) involved in sending a signal from, say, the brain to the foot.

Answer 2

both: conduct power through impulses or burst of ions/charges and have insulation (the cable has plastic coating , the muscle has myelin shealth), work in bundle format.reconnections can be made between imapied/injured fibers.but
the connections/power potential in cable can be regenerated with new material but the nerve fibers can't.