8. How does our body filter the air that we breathe? *
a. Hairs in your nose help filter out large particles.
b. Microscopic hairs, called cilia, are found along your air passages and move in a sweeping motion to keep the air passages clean.
c. Impurities that do reach the deeper parts of the lungs can often be moved up via mucous and coughed out or swallowed.
d. All of the above are correct.