<prompt> Calculate the minute ventilation from the spirogram assuming the respiratory rate as 12min1 Lmin2 Lmin4 Lmin6 Lmin  <response>: Ans. d 6LminRef: Guyton, 13th ed.P.503Minute ventilation tidal volume x respiratory rateHere tidal volume is 500 ml in the graph, it is seen as 3 L to 3.5 LSo, Minute ventilation 500x126Lmin 