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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. Which of the following will increase the loading of oxygen onto the hemoglobin molecule within the lungs?
2. 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.
3. In the model for quiet breathing, expiration is induced by ________.
4. The primary effect of increased PO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio.
5. The Haldane effect describes the increase in the affinity of hemoglobin for CO2 in the presence of a lowered ________.
6. 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.
7. A local bronchodilation within the alveolus will result in a(n) ________ in the ventilation-perfusion ratio in that region, whereas a vasoconstriction will result in a(n) ________ in the ventilation-perfusion ratio.
8. What is the most abundant gas in the air that we breathe?
9. As oxygen binds to hemoglobin, the ________ of the hemoglobin molecule will change through a process of ________ such that the binding of oxygen is enhanced.
10. What is a deficiency of oxygen in the tissues called?
11. Movement of oxygen and carbon dioxide between alveoli and blood occurs by what process?
12. At sea level, what is the normal partial pressure of carbon dioxide in pulmonary arteries?
13. What is the partial pressure of oxygen in air at sea level?
14. Each ________ on the hemoglobin subunit is capable of binding an oxygen molecule, thereby allowing ________ oxygen to bind with one hemoglobin molecule.
15. Hyperventilation would lead to a(n) ________ within the systemic arteries.
16. What is an increase in alveolar ventilation to match the demands of increased metabolic activity in the cells called?
17. At sea level, what is the normal partial pressure of oxygen in the systemic veins?
18. The buffering capacity of hemoglobin is directly related to its ability to bind with ________.
19. Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.
20. Where are the peripheral chemoreceptors in humans?
21. Which of the following statements is FALSE of a leftward shift in the hemoglobin-oxygen dissociation curve?
22. What percentage of air is carbon dioxide?
23. 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?
24. The blood in the pulmonary vein is called mixed venous blood.
25. What is the primary driving force for the binding of oxygen to hemoglobin?

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