In this lesson, students continue the process of inquiry as they follow the steps of the scientific method. Through exploration and discovery, they identify regions and functions of the brain and explore how the brain sends and receives messages. The activities in Lesson 3 will help the students recognize that carefully developed questions guide the scientific process. This lesson establishes the background knowledge necessary to understand how neurons work, the sequence of neuron message transmission, and how drugs interfere with the function and health of the brain.