AIIMS2018ZoologyBreathing and Exchange of Gases
The ventilation movements of the lungs in mammals are governed by
Options
- Amuscular walls of lung
- Bdiaphragm
- Ccostal muscles
- Dboth (b) and (c).
Correct answer
D. both (b) and (c).
Step-by-step solution
Ventilation is the movement of air through the conducting passages between the atmosphere and the lungs. The air moves through the passage because of pressure gradients that are produced by contraction and relaxation of diaphragm and intercostal muscles during inspiration and expiration.