Whatever investigation you and your group conducting in the previous lesson, you should have observed that the body does maintain homeostasis in several different systems. But how does that work? What part of your body controls this regulation? How do the systems of your body "talk" to each other to respond to changes in the external (and internal) environment?  How does your body "know" when the set point is not being met and conditions are out of balance? 

You and your classmates will be asked to perform a coordinated task without being able to talk directly to each other.  Your teacher will assign you into groups and give you a procedure to follow.