Question

Why do nerve cells have long fibres, whereas red blood cells are thin and disklike?

Answer 1

The red blood cells are thin, but rounded, like a bowl for example, to collect more oxygen with more surface area and also its easy to move around in the body. The nerve cell is long and has a tree like structure because it is needed to branch out and transport signals over long distances in a fast amount of time.

Answer 2

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Nerves carry information (motor or sensory) over long distances, so they need to be long and narrow to quickly send down info down its axon (the long part of a nerve).

Also, they are thin and has a large surface area because it allows diffusion of gases to occur quickly.