I transmit impulses without a single touch, guiding reactions with every such. What am I?

Category: Science · Difficulty: hard

Hint: Consider the chemicals that relay messages in the brain.

Answer

Neurotransmitters

Explanation

Neurotransmitters are chemicals that transmit signals across synapses in the nervous system.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Neurotransmitters.

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