During normal inspiration diaphragm goes down by?: (A) 1-2 cm, (B) 3-5 cm, (C) 5-7 cm, (D) 7-9 cm
Answer is A. 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.