Which parameter is almost same at apex and base of lung: March 2013: (A) pCO2, (B) O2 concentration in blood, (C) Ventilation, (D) Perfusion
Answer is B. Ans. B i.e. O2 concentration in blood At apex the O2 concentration is 20 ml/ 100 ml and at base the value is 19.2 ml/ 100 ml