EXAM III-version 1 - Spring/Summer 2008 BIO 4120 EXAM III...

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Spring/Summer 2008 BIO 4120 EXAM III 1. Air moves into the lungs because A) the gas pressure in the lungs is less than outside pressure B) the volume of the lungs decreases with inspiration C) contraction of the diaphragm decreases the volume of the pleural cavity D) contraction of the thorax decreases the volume of the lungs E) all of the above 2. What would cause the bronchioles to dilate A) increase in CO2 in expired air B) histamine release C) reflex neural control by the parasympathetic nervous system D) all of the above 3. Active expiration is produced by contraction of A) abdominal muscles only B) diaphragm and external intercostals C) abdominal muscles and internal intercostals D) internal intercostals only E) external intercostals only 4. In quiet breathing (at rest), A) inspiration and expiration involve muscular contractions B) inspiration is passive and expiration involves muscular contractions C ) inspiration involves muscular contractions and expiration is passive D) inspiration and expiration are both passive processes E) none of the above 5. The amount of air that remains in the lungs after maximal exhalation which is usually about 1200 ml is the A) tidal volume B) inspiratory reserve volume C) expiratory reserve volume D) minimal volume E) end volume 6. Julia is breathing 14 times per minute, with a tidal volume of 520 ml and a dead space of 152 ml. Lyle is breathing 15 times per minute, with a tidal volume of 400 mL and a dead space of 175 ml. Which patient has better alveolar ventilation? A ) Julia B) Lyle 7. Emphysema is a restrictive lung disease where loss of elastin in the alveoli can result in decreased _______ but normal _______. A) compliance, resistance B) compliance, elastance C ) elastance, compliance D) elastance, stretchability E) none of the above 1
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8. A shift in the hemoglobin saturation curve to the right can be caused by: A) a decrease in plasma pH B) an increase in plasma CO2 C) a fever D) chronic hypoxia E ) all of the above 9. The majority of the carbon dioxide in blood is transported by which mechanism: A) dissolved in the blood B) bound to Hb in red blood cells C ) in the form of HCO 3 - (bicarbonate ion) D) CO2 is transported evenly by all of the above mechanisms 10. The most important chemical controller of ventilation is A ) CO2 B) O2 C) H+ D) Cl- E) both CO2 and O2 11. An increase in airway resistance can be caused by A ) chronic bronchitis B) pulmonary edema C) emphysema D) pulmonary fibrosis E) all of the above 12. A device that measures the volume of air moved with each breath is called A) an auscultation device B) a heart monitor C) an EKG machine D ) a spirometer 13. Which of the following statements regarding the central chemoreceptor is true. A) it doesn’t respond to pH changes in the periphery
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EXAM III-version 1 - Spring/Summer 2008 BIO 4120 EXAM III...

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