1. _______ filter the blood to excrete harmful substances in the form of urine.   Kidneys   Lungs   Urinary bladder   Endocrine Glands   Hint Half-n-half Clue   2. Which type of teeth are used for tearing the food?   Canines   Molars   Premolars   Incisors   Half-n-half Clue   3. True or false: CO2 is formed as a waste product during respiration.   True   False   4. Gastric juice is secreted by   stomach   liver   small intestine   pancreas   Half-n-half Clue   5. True or false: Exchange of air takes place in the lungs.   True   False   6. Bile is secreted by the   liver   gall bladder   pancreas   small intestine   Half-n-half Clue   7. Voice box is the name given to the   larynx   trachea   pharynx   oral cavity   Half-n-half Clue