The nervous system controls all body activities by transmitting electrical and chemical signals. It allows you to sense your environment, think, move,
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How fast do nerve signals travel?
Nerve signals travel at speeds ranging from 0.5 to 120 meters per second depending on the nerve fiber. Signals in large myelinated axons travel fastest, up to 120 meters per second, while signals in small unmyelinated axons travel slowest.
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Can neurons be replaced if they are damaged?
Most neurons in the brain cannot be replaced. Neurons in the olfactory system and hippocampus can regenerate throughout life. Peripheral nerves can partially regenerate but usually more slowly than other body tissues. This is why nerve damage can cause permanent problems.
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What causes a stroke?
A stroke occurs when blood flow to the brain is blocked, usually by a blood clot. Without blood, brain cells cannot get oxygen and die within minutes. This can damage brain tissue and cause loss of speech, movement, or other functions depending on which area is affected.
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