Respiratory System Model Voice Over Science

My body system is the Respiratory System. My model shows the function of the lung. It shows this by when you pull on the bottom pink ballon that is the diaphragm. When you breathe, your diaphragm expands when you inhale to make room for the expanding lung. When you exhale, the lung deflates the oxygen and gives out carbon dioxide and the diaphragm goes back to it's normal place. The red balloon inside is the lung. This model shows how the lung inflates oxygen and deflates carbon dioxide. It shows how the lung works when you breathe.