Which of the following statement is incorrect w.r.t the mechanism of breathing ?

Options

A. The movement of air into and out of the lungs is carried out by crating a pressure gradient between the lungs and atmosphere
B. Inspiration is initiated by the contractions of diaphragm which increase the volume of thoracic chamber
C. The contraction of external intercostal muscles lifts up the ribs and sternum causing decrease in the volume of thoracic chamber
D. On an average , healthy human brathes 12-16 times/ min

Answer

C