1. It secretes pancreatic juice.   13   8   6   2   Hint Half-n-half Clue   2. Exchange of gases occurs here.   13   9   7   3   Half-n-half Clue   3. Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   1   8   3   14   Half-n-half Clue   4. It secretes saliva.   12   6   3   5   Half-n-half Clue   5. It pumps blood to various parts of the body.   8   13   3   7   Half-n-half Clue   6. Absorption of food occurs here.   11   9   8   15   Half-n-half Clue   7. It is a muscular tube containing semicircular rings of cartilages.   14   5   6   16   Half-n-half Clue