This activity should be prefaced by a brainstorming session in which the
students and instructor break down the various divisions of respiration. The
students should arrive at three discrete events which can be used to collect
data about the breathing process. These events will answer the following
questions: 1) How much air do we breathe out normally? 2)Is there any air left
in our lungs after we breathe normally? 3) How much is actually in our lungs
when we breathe normally? These questions will lead to the following