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Physiology

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Respiration

Question
9 out of 15
 

Ventilation perfusion Ratio is maximum in (LQ)



A Base of lung
B Apex of lung

C Post lobe of lung
D Middle lobe of lung

Ans. B Apex of lung

Ventilation / perfusion ration (VA/Q): ­

I. The ratio of pulmonary ventilation to pulmonary blood flow for the whole lung at rest is about 0.8. Q

II. Ventilation, as well as perfusion, in upright position declines in a linear fashion from the bases to the Apices of the lungs. Q

III. The ventilation/perfusion ratios are high in the upper portion of the lungs (Apices). Q

IV. Normally the VA/Qratio varies from about 0.6 at the base to about 3 at the apex of the lung. Q

V. Due to high VA/θ ratio at apices of the lungs, account for the predilection of T.B. for this area because the relatively high Alveolar Po2, provides favorable environment for the growth to mycobacterium tuberculosis. Q

Respiration Flashcard List

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