Residual volume is best measured by ?: (A) Body plethysmography, (B) Helium dilution method, (C) Spirometry, (D) All of above
Answer is A. Answer- A. Body plethysmographypulmonary plekysmographs are commonly used to measure the functional residual capacity (FRC) of the lungs - the volumein the lungs when the muscles of respiration are relaxed - and total long capacity