<h2><u>Answer:</u></h2>
Neurotransmitter is the correct answer.
<h3><u>Explanation:</u></h3>
The neurotransmitter, additionally called chemical transmitter or compound flag-bearer, any of a gathering of synthetic operators discharged by neurons (nerve cells) to animate neighboring neurons or muscle or organ cells, in this manner enabling driving forces to be passed starting with one cell then onto the next all through the sensory system.
Produce means to make soemthing, but since I can't see the paragraph, I can't fully answer the question, since theres no paragraph to follow it on. Sorry...
Just over the counter allergy medicine like Claritin and ect.