2 ms·

Sorry for off-topic, but: why are there many different neurotransmitters instead of a common single one? (I mean, sure, evolution, there's no "why", but I'm as

• jean_valje4n 5y ago
  Neurotransmitters are often synthesized from amino acids. They have different functions in the body, often either inhibiting or exciting the neuron that it targets. There are a bunch of different aspects to being awake. Caffeine works on adenosine, which has to do with wakefulness. But also things like adrenaline have a different aspect of wakefulness that amphetamines target. Modafinil targets orexin receptors I believe, which involve wakefulness as well as eating.