At a Busy Intersection, a Police Officer Directs Traffic

Multiple Choice

At a busy intersection, a police officer directs traffic. The movement of the cars is controlled by the police officer, who is responsible for communicating to drivers how to proceed. The role of the police officer is MOST similar to the role of _____ in brain functioning.

A) neurotransmitters
B) neurons
C) glands
D) the endocrine system