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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. 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?
2. At the same partial pressure, all gases in a solution will be at equal concentration.
3. Within an erythrocyte, the conversion of CO2 to bicarbonate is prevented from reaching equilibrium by the ________.
4. During intense exercise, the metabolic activity of muscle causes a ________ in the partial pressure of oxygen in the tissue, ________ the movement of oxygen into the tissue.
5. Hyperventilation decreases blood pH.
6. The compound 2,3-bisphosphoglycerate is a metabolic intermediate of glycolysis within the erythrocyte that can affect the binding of oxygen to hemoglobin.
7. Which of the following BEST describes a chemoreceptor response to PO2?
8. Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right?
9. The average respiratory quotient at rest and on a mixed diet is 0.5.
10. What is the primary driving force for the binding of oxygen to hemoglobin?
11. If oxygen is consumed by the body cells at a rate of 300 mL per minute, then how much oxygen diffuses from the alveoli into the blood in the pulmonary capillaries?
12. In the pulmonary arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
13. As humidity increases, the partial pressure of oxygen in air ________.
14. The buffering capacity of hemoglobin is directly related to its ability to bind with ________.
15. Which of the following statements about 2,3-BPG is FALSE?
16. Central chemoreceptors are neurons in the medulla that respond directly to changes in ________.
17. Where are the peripheral chemoreceptors in humans?
18. Each ________ on the hemoglobin subunit is capable of binding an oxygen molecule, thereby allowing ________ oxygen to bind with one hemoglobin molecule.
19. The venous blood in the right ventricle is referred to as ʺmixedʺ because the blood that enters the heart ________.
20. The primary effect of increased PCO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
21. Which of the following will increase the unloading of oxygen within the tissue?
22. The mixing of atmospheric air within the dead space of the conducting zone of the lung upon inspiration results in a partial pressure of ________.
23. Which of the following can increase the concentration of a particular gas in a solution?
24. What is the partial pressure of oxygen in air at sea level?
25. Which of the following statements is FALSE of a leftward shift in the hemoglobin-oxygen dissociation curve?

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