<prompt> During normal inspiration diaphragm goes down by?1-2 cm3-5 cm5-7 cm7-9 cm  <response>: Ans. is a i.e., 1-2 cmIn normal inspiration, the diaphragm descends 1-2 cm into the abdominal cavity producing a pressure difference of 1-3 mm hg and the inhalation of about 500 ml of air. 