A researcher is conducting an experiment where he tests a new drug to see its effect on neurons. As he monitors the brains of his test animals, he notices that their neurons have started to grow extra processes on the end of each axon. These extra cell growths are examples of:.

Terminal buttons

Explanation: Terminal buttons are the little rounded lump at the most extreme part of a lengthened fiber that cause to cover a wider range from the body of the cell to the terminal furthest parts, thereby conveying neural electrical impulse, which discharges distinct compounds named neurotransmitters. They virtually convert the pulse of electrical energy into chemical signals.