Show students the dryer hose to represent the trachea. The rings in the dryer hose keep it open, just as the rings of cartilage keep the trachea open. Show students a flattened tube sock or toothpaste tube to illustrate that the esophagus is flat when not in use. Show bunch of grapes to represent alveoli. Blow into the balloon and then release the air to show how the alveoli move air out of the lungs.
Guest speaker presents information.
Introduce the guest speaker to the class. Reflect, summarize and discuss. Respiratory System Point to each of the structures on the transparency and ask different students to describe what it does. Permission is granted to reproduce for educational non-commercial uses if this message is shown. All rights reserved.