1. 7   It is a muscular tube containing semicircular rings of cartilages.   Food is mixed with saliva here.   It pumps blood to various parts of the body.   Exchange of gases occurs here.   Hint Half-n-half Clue   2. 10   Undigested food is excreted out of the body through this opening.   Food is mixed with saliva here.   Bile is stored here.   These are formed by division of trachea.   Half-n-half Clue   3. 1   Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   Exchange of gases occurs here.   Most of the ingested water is absorbed here.   These are formed by division of trachea.   Half-n-half Clue   4. 13   Exchange of gases occurs here.   It secretes pancreatic juice.   It pumps blood to various parts of the body.   Bile is stored here.   Half-n-half Clue   5. 3   These are formed by division of trachea.   It secretes pancreatic juice.   Bile is secreted here.   It secretes saliva.   Half-n-half Clue   6. 11   Bile is secreted here.   Bile is stored here.   Undigested food is excreted out of the body through this opening.   These are formed by division of trachea.   Half-n-half Clue   7. 12   Churning of food occurs here.   It secretes saliva.   It pumps blood to various parts of the body.   Absorption of food occurs here.   Half-n-half Clue