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