1. 1   Exchange of gases occurs here.   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.   It secretes saliva.   Hint Half-n-half Clue   2. 8   Bile is stored here.   Undigested food is excreted out of the body through this opening.   It pumps blood to various parts of the body.   Churning of food occurs here.   Half-n-half Clue   3. 9   It pumps blood to various parts of the body.   Churning of food occurs here.   It is a muscular tube containing semicircular rings of cartilages.   Food descends from mouth to stomach through this muscular tube.   Half-n-half Clue   4. 6   Food is mixed with saliva here.   These are formed by division of trachea.   It is a muscular tube containing semicircular rings of cartilages.   Exchange of gases occurs here.   Half-n-half Clue   5. 2   Bile is secreted here.   These are formed by division of trachea.   Food is mixed with saliva here.   Exchange of gases occurs here.   Half-n-half Clue   6. 12   It secretes pancreatic juice.   Churning of food occurs here.   Exchange of gases occurs here.   Food is mixed with saliva here.   Half-n-half Clue   7. 16   Exchange of gases occurs here.   Food descends from mouth to stomach through this muscular tube.   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