Question

what is the speed of Nerve cells in our body to send the message to the brain

Answer 1

On average non-voluntary reflexes (which is actually information going to the CNS, being processed, and then going out to the motor neurons) take about 0.3 seconds. However, the average human can blink in about 0.1 seconds, which is probably a better measure. It is generally not a one-way process.

Answer 2

The speed of a nerve impulse varies with the type of nerve impulse the nervous system is sending. Some signals such as those for muscle position, travel at speeds up to 119m/s.