1. Inspiration occurs while there is a positive intra-pulmonary pressure with respect to thoracic chamber pressure.

2. Volume of air that will remain in the lungs after a normal inspiration is known as Tidal Volume (TV).

3. A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO₂ and bicarbonate ions.

4. In the tissues, low pH favours the dissociation of oxyhaemoglobin.

5. The trachea, primary, secondary, and tertiary bronchi, and initial bronchioles are not supported by incomplete cartilaginous rings.

6. At low pO₂, formation of oxyhaemoglobin is least likely.

7. The total volume of air a person can inhale after a normal breath is known as IC.

8. While breath out, a person could decrease the thoracic chamber pressure indirectly with the help of involuntary muscles, thereby decrease the pulmonary volume indirectly.

9. While breath in, a person could increase the thoracic volume directly with the help of involuntary muscles, thereby reduce the pulmonary volume directly.

10. A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to O₂ and HCO₃⁻ ions.

11. In the alveoli where pO₂ is higher, O₂ gets bound to haemoglobin which is easily dissociated at the tissues where pO₂ is low and pCO₂ and H+ concentration are high.

12. Volume of air that will remain in the lungs after a normal inspiration is known as Total Lung Capacity (TLC).

13. Each bronchus does not undergo repeated divisions to form the primary and secondary bronchi and bronchioles ending up in very thick tertiary bronchioles.

14. Partial pressure of Carbon dioxide pCO₂ in alveolar air is 159 mm Hg.

15. Some accounts suggest that the glottis is shielded by a thick elastic cartilaginous flap called epiglottis during swallowing to block food from entering the nasal chamber.

16. Expiration is a passive and prolonged process when compared to inspiration.

17. Partial pressure of Oxygen pO₂ in alveolar air is 40 mm Hg.

18. Dissociation of oxyhaemoglobin is more likely when pO₂ is high.

19. Additional volume of air, a person can expire by a forcible inspiration is known as Functional Residual Capacity (FRC).

20. During swallowing, glottis can be closed by a thick hyaline cartilaginous flap called glottis to prevent the entry of water into the larynx.

21. Some statements suggest that a thin elastic cartilaginous flap called glottis covers the epiglottis during swallowing to protect the nasal chamber from food.

22. The part starting with the external nostrils up to the tertiary bronchioles constitutes the respiratory part.

23. Exchange part is the site of actual diffusion of CO₂ but not O₂ between blood and tissues.

24. Approximately 25% of the CO₂ is transported from the tissue to the lungs via carboxyhaemoglobin.

25. Terrestrial animals (excluding amphibians) will not be having gills at any stage of life.

26. While breath in, a person could increase the thoracic volume indirectly with the help of voluntary muscles, thereby increase the pulmonary volume directly.

27. Exchange of O₂ and CO₂ between deoxygenated blood and alveoli, transport of these gases throughout the body by blood, exchange of O₂ and CO₂ between the oxygenated blood and tissues and utilisation of O₂ by the cells (cellular respiration) are the other steps involved.

28. At high pO₂, dissociation of oxyhaemoglobin is more likely.

29. Vascularised bags called lungs (cutaneous respiration) are used by all the terrestrial forms for the exchange of gases.

30. A chemosensitive area is situated adjacent to the respiratory rhythm centre which is highly sensitive to O₂ and bicarbonate ions.

31. The conducting part of the lung transports the atmospheric air to the alveoli, clears it from foreign particles, humidifies but does not bring the air to body temperature.

32. Additional volume of air, a person can expire by a forcible inspiration is known as Vital Capacity (VC).

33. The contraction of internal intercostal muscles lifts up the ribs and the sternum, causing a decrease in the volume of the thoracic chamber in the antero-posterior axis.

34. Each bronchus undergoes repeated divisions to form the secondary and tertiary bronchi and bronchioles ending up in very thick tertiary bronchioles.

35. Oxygen is transported mainly as oxyhaemoglobin.

36. At the ends of bronchiolar passages, alveoli appear as small sacs with thin, irregular walls.

37. While breath out, a person could increase the thoracic chamber pressure indirectly with the help of involuntary muscles, thereby decrease the pulmonary volume indirectly.

38. Partial pressure of Oxygen pO₂ in oxygenated blood is 40 mm Hg.

39. The pCO₂ of atmospheric air is having the least value among all atmospheric gases.

40. In humans, the secondary bronchi is/are not supported by incomplete cartilaginous rings.

41. Starting with the external nostrils up to the primary bronchioles constitutes the respiratory part.

42. The part starting with the internal nostrils up to the terminal bronchioles constitutes the exchange part.

43. Among invertebrates, fishes use gills whereas amphibians, reptiles, birds, and mammals respire through lungs.

44. During swallowing, epiglottis can be covered by a thin hyaline cartilaginous flap called glottis to prevent the entry of food into the pharynx.

45. While breath out, a person could decrease the thoracic chamber pressure directly with the help of voluntary muscles, thereby increase the pulmonary volume indirectly.

46. It is also claimed that the glottis is closed off by a thick elastic cartilaginous flap named glottis to stop food entry into the nasal chamber during swallowing.

47. Vascularised bags called lungs (branchial respiration) are used by all the terrestrial forms for the exchange of gases.

48. Conducting part is the site of actual diffusion of CO₂ but not O₂ between blood and tissues.

49. Respiratory rhythm is regulated by the respiratory centre in the medulla oblongata of the brain.

50. Partial pressure of Oxygen pO₂ in tissue is 45 mm Hg.