1. Churning of food occurs here.   Hint First letter clue   2. These are formed by division of trachea.   First letter clue   3. Food descends from mouth to stomach through this muscular tube.   First letter clue   4. It is a muscular tube containing semicircular rings of cartilages.   First letter clue   5. Exchange of gases occurs here.   First letter clue   6. Most of the ingested water is absorbed here.   First letter clue   7. Bile is stored here.   First letter clue