Question

The ventilation movements of the lungs in mammals are governed by

• A. muscular walls of lung
• B. diaphragm
• C. costal muscles
• D. both (b) and (c).

Answer 1

Answer: (D)

both (b) and (c).

The relaxation and contraction of the diaphragm and the movement of the costal muscles present in the thorax of an individual are responsible for the ventilation movements of the lungs that facilitate respiration.

So, the correct answer is 'both (b) and (c)'.