SMRTR Science & EngineeringMar 11, 2026Nautilus

The Secret Life of Neurotransmitters

SMRTR summary

Beyond their famous role in creating good feelings in the brain, neurotransmitters like dopamine and serotonin secretly perform crucial jobs throughout the human body, regulating blood pressure in kidneys, controlling blood sugar in the pancreas, and managing immune responses in the gut. These chemical messengers have existed for hundreds of millions of years before brains evolved, helping simple organisms like sea sponges and even plants communicate and defend themselves.

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