951. Alveoli can be found in:
A. Main Bronchi
B. Lobar Bronchi
C. Segmental Bronchi
D. Terminal Bronchiole
E. Respiratory Bronchiole

952. Surface area of alveoli in an average adult lung is approximately:
A. 10-20 m2
B. 20-40 m2
C. 50-100 m2
D. 100 -150 m2
E. 150 -200 m2

953. Normal mean pulmonary arterial pressure is:
A. 15 mmHg
B. 25 mmHg
C. 50 mmHg
D. 75 mmHg
E. 100 mmHg

954. Bronchial artery supplied the following EXCEPT:
A. Lobar bronchi
B. Segmental bronchi
C. Terminal bronchiole
D. Respiratory bronchiole
E. None of the above

955. The following lung volumes can be measured with spirometer EXCEPT:
A. Vital capacity
B. Total lung capacity
C. Tidal volume
D. All of the above
E. None of the above

956. Anatomical dead space is normally approximately:
A. 50 ml
B. 100 ml
C. ISO ml
D. 200 ml
E. 250 ml

957. According to Fick’s law of diffusion, velocity of gas exchange varies:
A. Proportionally to the area of gas exchange
B. Inversely to the thickness of gas exchange surface
C. Proportionally to the pressure difference across the 2 surface
D. All of the above
E. None of the above

958. Which of the following gas is diffusion limited under normal conditions:
A. Nitrous oxide
B. Carbon monoxide
C. Carbon dioxide
D. Oxygen
E. All of the above

959. Which of the following statements is INCORRECT:
A. Pulmonary capillary caliber is determined by lung volumes as they are opened by radial traction.
B. Increased pulmonary arterial pressure lead to decreased pulmonary resistance.
C. Distention of pulmonary capillary is the chief mechanism of reducing pulmonary resistence at high pulmonary pressure.
D. Noradrenaline administration can lead to increased pulmonary vascular resistance.
E. Isoprenaline administration can lead to decreased pulmonary vascular resistance. 

960. In Zone 2 of the lung, the pressure difference are:
A. PA>Pa>Pv
B. PA> Pv> Pa
C. Pa> Pv> PA
D. Pv>Pa>PA
E. Pa> PA> Pv

NOTE
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