MediumScience
"I carry messages faster than thought from every corner of your body to your brain. I am thinner than a hair yet I can be over a metre long. What am I?"
Answer
A Nerve
Explanation
Nerve fibres transmit electrical impulses at speeds of up to 120 metres per second. The sciatic nerve, running from the spinal cord to the foot, can be over a metre in length — the longest single nerve cell in the body.
This is a medium riddle in the Science category — Riddles about physics, space, biology and the laws of the universe.
Tags:bodyscience
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