During Inspiration, the _______

Question

During inspiration, the _______.
A) diaphragm contracts and flattens and the intercostal muscles contract
B) diaphragm and intercostal muscles relax, permitting the elastic tissues of the lung to recoil
C) diaphragm does not play a role
D) external intercostal muscles relax

Accepted Answer

During inspiration, the diaphragm contracts and flattens, while the intercostal muscles contract, which increases the volume of the thoracic cavity, and decreases the pressure inside the lungs, allowing air to flow in.