'A natural pain-killer, this "oxygenous morphine" is released by the brain during body stress'
Endorphin
THE HUMAN BODY: A natural pain-killer, this oxygenous morphine is released by the brain during body stress
A natural pain-killer, this "oxygenous morphine" is released by the brain during body stress
A natural pain-killer, this "oxygenous morphine" is released by the brain during body stress
THE HUMAN BODY
Endorphin
THE HUMAN BODY