Which of the following true about ventilation and perfusion in alveoli in erect posture?: (A) Ventilation/perfusion ratio is maxm at apex, (B) Ventilation/perfusion ratio is maxm at base, (C) Ventilation is max at apex, (D) Perfusion is max at apex
Answer is A. The V/Q ratio can therefore be defined as the ratio of the amount of air reaching the alveoli per minute to the amount of blood reaching the alveoli per minute--a ratio of volumetric flow rates. ... The V/Q ratio can be measured with a ventilation/perfusion scan. A V/Q mismatch can cause a type 1 respiratory failure Ref: guyton and hall textbook of medical physiology 12 edition page number: 320,321,322