1. Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   1   3   11   5   Hint Half-n-half Clue   2. It is a muscular tube containing semicircular rings of cartilages.   5   7   2   13   Half-n-half Clue   3. These are formed by division of trachea.   13   12   16   6   Half-n-half Clue   4. Churning of food occurs here.   12   13   2   10   Half-n-half Clue   5. Bile is secreted here.   6   1   15   11   Half-n-half Clue   6. Exchange of gases occurs here.   15   7   11   13   Half-n-half Clue   7. Food is mixed with saliva here.   7   15   2   12   Half-n-half Clue