<prompt> In the expiratory flow volume loop shown below, what is the vital capacity:1 liter5.5 liters3 liters4.5 liters  <response>: Ans. d 4.5 litersRef. Guyton and Hall Physiology Review, 3rd edp.127In the graph, residual volume RV is 1 LTotal lung capacity TLC is 5.5 LVital capacity is TLC-RV4.5L 