Question

Lungs ventilation movement are due to the movements of

• A. Coastal muscles and diaphragm
• B. Coastal muscles only
• C. Diaphragm only
• D. Wall of the lungs

Answer 1

The correct option is A Coastal muscles and diaphragm

Lung ventilation is the breathing process. Lung ventilation movement are due to the movements of coastal muscles and diaphragm. During inhalation, internal intercoastal muscles relax and external intercoastal muscles contract. This results in outward and upward movement of ribcage. During inhalation, diaphragm contracts and moves downwards. During exhalation, external intercostal muscles relax and the internal intercostal muscles contract. This results in downward and inward movement of ribcage. During inhalation, diaphragm relaxes and moves upwards.

Thus, the correct answer is option A.