Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 13

From end bulbs, chemical keys or (a) _____ are secreted into the synapse. These chemical keys open matching locks called (b) _____ , which are located on the surface of neighboring dendrites, muscles, or organs. Neurotransmitters that open a receptor's lock are called (c) _____ ; neurotransmitters that block a receptor's lock are called (d) _____.