The substance released at axon terminals to propagate a nervous impulse is called a(n) ________. Naim 23:43 Fundamental of the Nervous System and Nervous Tissue The substance released at axon terminals to propagate a nervous impulse is called a(n) ________. A) ion B) cholinesterase C) neurotransmitter D) biogenic amine Answer: C) neurotransmitter Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+