Which of the following statement is incorrect w.r.t the mechanism of breathing ?
A. Movement of air into and out of the lungs is carried out by creating a pressure gradient between the
lungs and the atmosphere
B. Inspiration is initiated by contraction of diaphragm which increases the volume of thoracic chamber
C. The contraction of external intercostal muscles lifts up the ribs and the sternum causing decrease in
the volume of thoracic chamber
D. On an average, a healthy human breathes 12 - 16 times/minute.
