A. Choose the letter of the best answer.
1. These parts are lined with mucus that help filter dust particles.
a. nasal cavity and larynx
b. nasal cavity and lungs
c. nasal cavity and epiglottis
d. nasal cavity and trachea
2. What is the function of the tonsils?
a. They warm and moisten the air that enters through the nose.
b. They trap and destroy bacteria that enter through the nose.
c. They prevent food from entering the windpipe.
d. They vibrate in order to produce sounds.
3. What happens during in inhalation?
a. The ribs and diaphragm contract.
b. The ribs and diaphragm relax.
c. The chest cavity becomes smaller.
d. Air rushes out of the lungs.
4 Where does the exchange of gases take place?
a. trachea
b. bronchi
calveoli
d. nostrils
5. Where is the diaphragm located?
a. below the voicebox or larynx
b. covering the top of the voicebox or larynx
c. at the bottom of the trachea
d. below the lungs​