Do neurons secrete multiple neurotransmitters, or just one type? I know that neurons communicate between each other by filling the junction between dendrites with neurotransmitters. **What interests me is if a single neuron only works with one type of neurotransmitter(ex: serotonin), or if it can secrete/receive all of them (serotonin, dopamine, etc).** If a neuron can secrete all, then can all dendrites secrete and respond to all neurotransmitters, or is it one per dendrite (one branch only works with dopamine, another one with serotonin, etc)?

I've googled this for a biology class I taught, and the quick answer is that both possibilities happen in different instances. Some specialized neurons secrete more than one type, even though the ruling concept used to be one neurotransmitter for one neuron.