(1)  The lung on the___________side of the body is a little smaller in order to leave extra space for the heart.

(2)  Beneath the lungs is a muscle that works with the lungs to allow breathing.  It is called the_______________.

(3)  At the bottom end of the trachea (windpipe) the tubes called bronchi lead into each lung.  At the end of each bronchi are about 30,000 tiny tubes called________________.

(4)  At the end of each bronchiole are tiny air sacs called_______________.

(5)  The alveoli are covered with small blood vessels called______________.

(6)  As air is inhaled (breathed in) through the trachea, tiny hairs called______________
keep dirt out of the lungs.

(7)  After the cells have used the oxygen they need, they produce_________________
which must leave the body.

(8)  Above the trachea is the_______________(voice box).  Across it are two tiny ridges called__________________which open and close to make sounds.

(9)  The best way to keep the lungs healthy is not to______________!

(10)  _______________also helps to keep lungs strong and healthy.