lung ventilation movements are due to

Options

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

Answer

A

Explanation

Lung ventilation movements are due to coastal muscles and diaphragm . Coastal muscles induce external intercostals muscles which contracts and thus increases thoracic cavity and internal intercostals muscles which relax and thus decreases thoracic cavity
Diaphragm (phrenic muscles ) on contraction increases thoracic cavity and on relaxation decreases thoracic cavity .