This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Gynaecology & Obstetrics
Which of the following is false as physiological change in pregnancy? 
Select and explain. 
A. Increase cardiac output, B. Increase total protein, C. Increase residual volume, D. Increase GFR
C: Increase residual volume
Answer: C: Increase residual volume 
Explanation: In Pregnancy, diaphragm pushed upwards by enlarged Uterus thus reducing Residual volume of lungs. Diaphragm is elevated by around 4cm subcostal angle increases from 68o to 104o. Transverse diameterof chest increases by 2 cm Changes in Respiratory System Parameters Non pregnant Pregnancy near term Change Respiratory rate/min 15 15 unaffected Vital capacity (mL) 3200 3300 Almost unaltered Tidal volume (mL) 500 700 + 40% Residual volume (mL) 965 765 - 20% Inspiration capacity (IC) 2500 2650 + 10% Minute ventilation 7.5 L/min 10.5 L/min + 40% Total lung capacity (mL) 4200 4000 - 5%( almost unchanged)