6. It is the main passageway of air going to the lungs. ____________________, Trachea, 7. These tiny air sacs inside the lungs are where gas exchange happens. ____________________, Alveoli, 8. The two branches of the trachea that carry air into each lung. __________________, Bronchi, 9. The main organs of the respiratory system. _________________, Lungs, 10. The muscle that moves up and down to help us breathe. ____________, Diaphragm.

Leaderboard

Visual style

Options

Switch template

)
Continue editing: ?