Respiration – structures, pigments, gas transport and regulation - One Line Questions

1. What is the approximate percentage of oxygen transported by hemoglobin in the blood? — 98.5%
2. The partial pressure of oxygen (PO2) in the tissues is typically around: — 40 mmHg
3. What is the partial pressure of oxygen (PO2) in deoxygenated blood entering the lungs? — About 40 mmHg
4. What is the partial pressure of carbon dioxide (PCO2) in the alveoli? — About 40 mmHg
5. What is the partial pressure of oxygen (PO2) in the alveoli? — About 100 mmHg
6. The movement of gases across the respiratory membrane is driven by: — Diffusion
7. The process of exhalation during normal, quiet breathing is primarily: — A passive process due to elastic recoil
8. In terrestrial invertebrates like insects, gas exchange occurs through a system of tubes called: — Tracheae
9. Which of the following has the highest affinity for hemoglobin compared to oxygen? — Carbon monoxide
10. The enzyme responsible for catalyzing the formation of bicarbonate ions from carbon dioxide and water in red blood cells is called: — Carbonic anhydrase
11. Which part of the brain contains chemoreceptors that are sensitive to changes in blood CO2 and pH levels? — Medulla oblongata
12. The rate of breathing is primarily regulated by the respiratory center located in which part of the brain? — Medulla Oblongata
13. Hemerythrin is a respiratory pigment found in some marine invertebrates, which contains: — Iron
14. Which law states that the volume of a gas is inversely proportional to its pressure at a constant temperature? — Boyle's Law
15. In birds, the respiratory system is unique due to the presence of: — Air sacs
16. The process by which air moves into and out of the lungs is known as: — Ventilation
17. What is the primary mechanism by which carbon dioxide is transported in the blood? — As bicarbonate ions
18. The process of breathing in is called: — Inspiration
19. In mammals, the primary muscle involved in quiet inspiration is the: — Diaphragm
20. The process of gas exchange between the blood and the body tissues is called: — Internal respiration
21. In which organism is respiration mediated by book lungs? — Scorpion
22. Which of the following is the primary respiratory pigment in most vertebrates? — Hemoglobin
23. Which respiratory pigment is found in the hemolymph of some arthropods and mollusks, and contains copper instead of iron? — Hemocyanin
24. Which respiratory pigment is found in the blood of some marine worms and contains iron, but is not contained within red blood cells? — Chlorocruorin
25. The respiratory pigment in the blood of some annelids (like earthworms) is dissolved directly in the plasma and is called: — Hemoglobin
26. Which of the following respiratory pigments has the lowest affinity for oxygen? — Hemocyanin
27. Which of the following conditions leads to a decrease in hemoglobin's affinity for oxygen? — Increased temperature
28. Which of the following conditions would DECREASE the release of oxygen from hemoglobin to the tissues? — Increased PO2
29. The exchange of gases between the air in the alveoli and the blood in the pulmonary capillaries is called: — External respiration
30. What is the role of the pons in respiratory regulation? — It modifies the rate and depth of breathing initiated by the medulla
31. When the partial pressure of CO2 in the blood increases, what happens to the affinity of hemoglobin for oxygen? — It decreases
32. Which of the following statements about hemoglobin is FALSE? — It transports most of the carbon dioxide in the blood.
33. What is the primary role of the diaphragm during inspiration? — It contracts and moves downward, increasing thoracic volume
34. What is the main stimulus that triggers an increase in breathing rate? — High carbon dioxide levels
35. In fish, gas exchange occurs across which specialized structures? — Gills
36. Which group of animals typically uses cutaneous respiration (breathing through the skin)? — Amphibians
37. Which part of the respiratory system acts as a common passage for both food and air? — Pharynx
38. The ' Haldane effect' describes the influence of oxygen levels on the transport of which gas? — Carbon dioxide
39. The main function of the respiratory system is to facilitate: — Gas exchange
40. The 'chloride shift' is a process associated with the transport of which gas in red blood cells? — Carbon dioxide
41. The structure responsible for producing vocal sounds is the: — Larynx
42. The structure that connects the larynx to the bronchi is the: — Trachea
43. The vocal cords are located within the: — Larynx
44. Myoglobin is a protein that stores oxygen primarily in which type of tissue? — Muscle cells
45. Which chamber of the human heart receives oxygenated blood from the lungs? — Left atrium
46. The Bohr effect describes the influence of which factor on the oxygen-binding affinity of hemoglobin? — All of the above
47. What is the primary function of the nasal conchae? — To humidify, warm, and filter inhaled air
48. What is the main function of the epiglottis? — To prevent food from entering the trachea
49. What is the role of surfactant in the alveoli? — To reduce surface tension and prevent alveolar collapse
50. In which part of the human respiratory system does gas exchange primarily occur? — Alveoli
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