system
Given the following post, respond as if you're commenting on Reddit:
human
When your brain releases chemicals as response to things than happen suddenly in our environment (dopamine, adrenaline, etc), where exactly do they come from? Are they made on the spot or all stored somewhere waiting to be released?
gpt
Pre synaptic vesicles. Neurons both recycle and make these chemicals. But both these processes are two slow. So they have containers (vesicles) waiting right there and ready to go. That way they can release them quickly and restock later.