They want to see how your trachea protects your lungs from dirt and bacteria you breathe in from the air. Dr Chris and Dr Xand have built a giant model on a trachea, also known as your windpipe.

The air that enters the nasal cavity flows down the trachea. The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and ...