1. Which of the following helps in digestion? A. Pancreatic juice B. Saliva C. Bile D. All of these   A   B    C   D   Hint Half-n-half Clue   2. Larger dust particles in the inhaled air are trapped in the   nose   pharynx   epiglottis   larynx   Half-n-half Clue   3. _______ filter the blood to excrete harmful substances in the form of urine.   Kidneys   Lungs   Urinary bladder   Endocrine Glands   Half-n-half Clue   4. True or false: Exchange of air takes place in the lungs.   True   False   5. Which of the following helps keep the human body cool? A. Respiration B. Mastication C. Perspiration D. Urination   A   B   C    D   Half-n-half Clue   6. Epiglottis guards the opening of larynx into pharynx.   True   False   7. _______ are formed by the division of trachea.   Bronchi   Bronchioles   Air sacs   Ureters   Half-n-half Clue