2. Use the word bank to match the term to the definition and to fill in the blanks below.
lungs diaphragm nasal passages
trachea bronchi alveoli
1. - These little sacs are where carbon dioxide leaves the blood and
oxygen enter it.
2. - This large muscle helps you fill and empty your lungs.
3. - You inhale air through these about 20 times a minute.
4. - Two large, and very important, organs inside your chest cavity.
5. - This tube that carries air to lungs.
6. - The tube inside the lungs that leads to the alveoli.
Respiration begins in the , where air comes into the body.
Air travels through the to the . The
pushes up and down to fill and empty the lungs. Inside the lungs,
air in the travels to the small sacs called . Inside
those small sacs is where the important gas exchange occurs