1. 1   Food descends from mouth to stomach through this muscular tube.   It pumps blood to various parts of the body.   It secretes saliva.   Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   Hint Half-n-half Clue   2. 2   Food is mixed with saliva here.   It secretes saliva.   It pumps blood to various parts of the body.   Undigested food is excreted out of the body through this opening.   Half-n-half Clue   3. 3   Exchange of gases occurs here.   It secretes saliva.   Undigested food is excreted out of the body through this opening.   Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   Half-n-half Clue   4. 16   Bile is secreted here.   Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   It is a muscular tube containing semicircular rings of cartilages.   Undigested food is excreted out of the body through this opening.   Half-n-half Clue   5. 14   It secretes saliva.   Most of the ingested water is absorbed here.   Churning of food occurs here.   Larger dust particles in the inhaled air are trapped in the mucus and hair found here.   Half-n-half Clue   6. 5   Absorption of food occurs here.   Bile is stored here.   These are formed by division of trachea.   It is a muscular tube containing semicircular rings of cartilages.   Half-n-half Clue   7. 7   Absorption of food occurs here.   These are formed by division of trachea.   It secretes saliva.   Exchange of gases occurs here.   Half-n-half Clue