functions of lung ?

i. Angiotension converting enzyme is located in caveolae intracellulars on surface of
pulmonary capillary endothelial cells and convert Angiotension | to Angiotension II.
ii. Major site of inactivation of serotonin is lung and it is by enzymatic degradation.
iii. Prostaglandins E1, E2 and F2e are activated in lung.

iv. Lung secrets IgA in bronchial mucus.

A:-All the above i, ii, iii and iv
B:-i, ii and iv only

C:-i and iv only

D:-ii and iii only

Correct Answer:- Option-C

Question57:-Which of the following statement is/are false ?

i. V/Q decreases from top to bottom of lung.

ii. Pulmonary capillary uptake of oxygen is complete in 0.50 sec.

iii. 0.50 sec is the time available in pulmonary capillary for exchange of ௦; 800 ௦0.
iv. 02 uptake in pulmonary capillary is usually perfusion limited, but partially
diffusion limited also in diseased state.

A:-Only i and iii

B:-Only ii and iii

C:-Only iii and iv

D:-Only i and iv

Correct Answer:- Option-B

Question58:-Which of the following statement is/are true about long term
adaptation to high attitudes ?

i. Reduced arterial Po, triggers adaptations mainly mediated by increase in hypoxia
inducible factor I.

ii. Kidney excrete alkaline urine.

iii. Expression of oxidative enzymes in mitochondria.

iv. Right ventricular hypertrophy increases pulmonary arterial pressure increasing
perfusion to well ventilated regions of lung.

A:-Only i and ii

B:-Only i, ii, iii

C:-Only i, iii and iv

D:-All the above i, ii, iii, iv
Correct Answer:- Option-C

Question59:-Which of the following statement is/are true about hypoxia ?

i. In carbon monoxide poisoning arterial blood ‏ومع‎ remains normal.

ii. In hypoperfusion hypoxia and histotoxic hypoxia, administration of oxygen rich
gas mixture is of very limited value.

iii. In carbonmonoxide poisoning death results when 70-80% of circulating
hemoglobin is converted to COHb.

iv. Most common form of hypoxia seen clinically is hypoxic hypoxia.

A:-Only i, ii and iii