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Physiology Practice Test: The Respiratory System - Gas Exchange and Regulation of Breathing
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Physiology Practice Test: The Respiratory System - Gas Exchange and Regulation of Breathing
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25 Questions

1. As humidity increases, the partial pressure of oxygen in air ________.
2. At sea level, what is the normal partial pressure of carbon dioxide in systemic veins?
3. Bicarbonate is an important buffer in blood, whose concentration is regulated by the ________.
4. In the systemic arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
5. The reaction catalyzed by carbonic anhydrase is an irreversible reaction.
6. Where in blood does the conversion of CO2 to bicarbonate occur?
7. Within an erythrocyte, the conversion of CO2 to bicarbonate is prevented from reaching equilibrium by the ________.
8. Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right?
9. Which of the following is NOT one of the sensory receptors that alter the output from the central pattern generator?
10. Pulmonary edema describes a condition where the uptake of oxygen and unloading of carbon dioxide is reduced as a consequence of a(n) ________.
11. A typical value for blood PO2 in the pulmonary vein is ________, whereas PCO2 is ________.
12. What is a decrease in oxygen in the blood called?
13. If hemoglobin is saturated (1.3 mL of oxygen per gram) and there are 150 grams of hemoglobin per liter of blood, how much oxygen can be delivered to the tissue if cardiac output is 15 liters per minute?
14. During active breathing, bursts of action potentials are observed to occur ________.
15. Inspiratory neurons are located in the ________.
16. Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood ________.
17. Oxygenated blood is found in which of the following?
18. The primary effect of increased PO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
19. Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.
20. The hydrogen ions released by the dissociation of carbonic acid are buffered by their ________.
21. The ________ is the respiratory center that appears to facilitate the transition between inspiration and expiration.
22. What is the definition of anemia?
23. In the pulmonary arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
24. Which of the following causes a decrease in the PO2 of air as it enters the conducting zone of the lungs?
25. The majority of oxygen present within the blood is ________.