<prompt> True statement regarding difference between apex and base of lung, in erect posture is:March 2012, March 2013V Q is low at the apex of lungV Q is high at the apex of lungV Q remain same at both apex and baseNone of the above  <response>: Ans: B i.e. V Q is high at the apex of lungV Q changes from region to region of the lung.Thus in apical zone in the erect posture, Q perfusion is very low and therefore V Q ratio is high. While at the bases, it V Q is low 