True regarding changes in respiratory system in pregnancy: (A) Respiratory rate increase, (B) Vital capacity remains unchanged, (C) Tidal volume increase, (D) Total lung capacity increases
Answer is C. Respiratory rate/min 15 15 UnaffectedVital capacity 3200 3300 Almost unchangedTidal volume (ml) 475 675 +40%Residual volume (ml) 965 765 -20%Total lung capacity 5000 4750 -8%