Students learn how cells produce wastes and how the body excretes these wastes. By the end of eighth grade, students will develop an understanding of personal health. Students use scientific methods to determine how their level of physical activity changes the amount of carbon dioxide exhaled from their bodies. Students exhale into a bromothymol blue solution to test for the presence of carbon dioxide in their breath after they rest, walk, and then run. Students will find that the amount of carbon dioxide excreted by their bodies increases with physical exercise.
Students make a model of the respiratory system.
The model is used to demonstrate what happens to the lungs when the diaphragm contracts and expands.