Respiratory+System

Create a working model of the lungs using the following items:
 * clear plastic soft drink bottle
 * 2 balloons
 * 2 rubber bands
 * plasticine or blu-tack
 * scissors
 * 2 plastic drinking straws

The job of the respiratory system is to **exchange gases** with the outside environment - oxygen must be absorbed from the air and carbon dioxide must be released from the body. The respiratory system works best when it has a large surface area and close connections with the circulatory system.

Trachea Bronchus Lungs Alveoli