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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. A decrease in PCO2 within the lung will result in a ________ in the pulmonary vasculature and a ________ in the bronchioles.
2. What is a deficiency of oxygen in the tissues called?
3. The average respiratory quotient at rest and on a mixed diet is 0.5.
4. What is the definition of anemia?
5. What percentage of air is oxygen?
6. What is the most abundant gas in the air that we breathe?
7. Which of the following will increase the unloading of oxygen within the tissue?
8. A typical value for blood PO2 in the pulmonary vein is ________, whereas PCO2 is ________.
9. The blood in the pulmonary vein is called mixed venous blood.
10. Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.
11. 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?
12. Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood ________.
13. In the systemic arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
14. At equilibrium, the gas molecules that dissolve in solution and those that remain in the gaseous phase are, by definition, at the same ________.
15. In the pulmonary arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
16. In the model for quiet breathing, expiration is induced by ________.
17. Which of the following is NOT part of the pathway that must be crossed by oxygen on its way to binding with hemoglobin?
18. During quiet breathing, a personʹs breathing cycle consists of ________.
19. The primary effect of increased PCO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
20. Which of the following is NOT one of the sensory receptors that alter the output from the central pattern generator?
21. The primary effect of increased PO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
22. What is the primary mechanism of carbon dioxide transport in blood?
23. The hydrogen ions released by the dissociation of carbonic acid are buffered by their ________.
24. At sea level, what is the normal partial pressure of carbon dioxide in systemic veins?
25. As oxygen binds to hemoglobin, the ________ of the hemoglobin molecule will change through a process of ________ such that the binding of oxygen is enhanced.

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