Unit 13 Practice Quiz
Your LAST Name:
1. Hyperventilation leads to all of the following EXCEPT:
buildup of carbon dioxide in the blood
brief periods of apnea
2. The most important chemical stimuli leading to increased rate and depth of breathing is:
increased hydrogen ion in the blood
decreased carbon dioxide in the blood
increased carbon dioxide in the blood
decreased oxygen level in the blood
increased blood pH
3. Most carbon dioxide is transported within blood plasma as:
4. Which one of the following is NOT true of inspiration:
relaxation of the external intercostal muscles helps increase the size of the thoracic cavity
the decreased gas pressure produces a partial vacuum that forcibly sucks air in
contraction of the diaphragm muscle helps increase the size of the thoracic cavity
air continues to move into the lungs until intrapulmonary pressure equals atmospheric pressure
increased intrapulmonary volume causes inhaled gases to spread out
5. Gas volume is
directly proportional to pressure.
directly proportional to temperature.
indirectly proportional to pressure.
indirectly proportional to temperature.
Choice 2 and 3 only
6. The enzyme carbonic anhydrase causes
water to react with hydrogen ions.
water to react with bicarbonate ions.
none of these answers
carbon dioxide to react with bicarbonate ions.
carbon dioxide to react with water.
7. The actual sites of gas exchange within the lungs are
8. The molecule that prevents lung collapse by lowering the surface tension of the water film lining each alveolar sac is called:
9. Air moving in and out of the lungs is called:
10. The walls of the alveoli are composed largely of:
simple cuboidal epithelium
stratified squamous epithelium
simple squamous epithelium
stratified cuboidal epithelium
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