1. True or False: Two-layered membrane which covers the lungs is known as pericardium.   True   False   2. Normal rate of respiration in an adult human being is _______ times/ minute. A. 10-12 B. 12-14 C. 16-18 D. 22-24   A   B   C   D   Hint Half-n-half Clue   3. Exchange of air occurs in _______ which are also known as 'air sacs'.   Bronchioles   Bronchi   Alveolar ducts   Alveoli   Half-n-half Clue   4. True or False: Exhalation and inhalation of air is known as "cellular respiration".   True   False   5. Which process does not occur in the nasal cavity? A. Trapping of large foreign bodies B. Exchange of gases C. Humidification of inhaled air D. Warming of inhaled air   A   B   C   D   Half-n-half Clue   6. Spirometer measures: A. Capacity of lungs B. Volume of air inhaled and exhaled C. Residual air D. All of these   A   B   C   D   Half-n-half Clue   7. Identify diaphragm in this diagram.   B   C   D   E   Half-n-half Clue