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Physiology Practice Test: The Respiratory System - Gas Exchange and Regulation of Breathing
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Related Test: Physiology Practice Test: The Respiratory System - Pulmonary Ventilation

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

1. Bicarbonate is an important buffer in blood, whose concentration is regulated by the ________.
2. At sea level, what is the normal partial pressure of oxygen in the systemic veins?
3. Over a period of time and under resting conditions, the amount of carbon dioxide generated by the body is greater than the amount of oxygen the body consumes.
4. Which of the following will increase the loading of oxygen onto the hemoglobin molecule within the lungs?
5. A decrease in PCO2 within the lung will result in a ________ in the pulmonary vasculature and a ________ in the bronchioles.
6. Which of the following is NOT part of the pathway that must be crossed by oxygen on its way to binding with hemoglobin?
7. Which of the following causes a decrease in the PO2 of air as it enters the conducting zone of the lungs?
8. At sea level, what is the normal partial pressure of carbon dioxide in pulmonary arteries?
9. The primary effect of increased PCO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
10. At sea level, what is the normal partial pressure of carbon dioxide in systemic veins?
11. Within an erythrocyte, the conversion of CO2 to bicarbonate is prevented from reaching equilibrium by the ________.
12. Which of the following is NOT one of the sensory receptors that alter the output from the central pattern generator?
13. What is the most abundant gas in the air that we breathe?
14. Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on ________.
15. Where in blood does the conversion of CO2 to bicarbonate occur?
16. Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right?
17. What is the primary driving force for the binding of oxygen to hemoglobin?
18. As it leaves the lung in the pulmonary vein, blood is ________ saturated with oxygen.
19. 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?
20. Under resting conditions, equilibration between alveolar PO2 and PCO2 with blood PO2 and PCO2 in the pulmonary capillaries occurs in approximately how many seconds?
21. Hyperventilation would lead to a(n) ________ within the systemic arteries.
22. Under resting conditions, equilibration between alveolar PO2 and PCO2 with blood PO2 and PCO2 in the pulmonary capillaries is completed by the time the blood has traveled what portion of the distance of the pulmonary capillaries?
23. There is a substantial safety margin for the uptake of gases in the alveolus because at rest, blood is completely oxygenated after traveling only 1/3 the length of the pulmonary capillary bed.
24. What is the definition of anemia?
25. At sea level, what is the normal partial pressure of oxygen in the pulmonary veins?

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