Question

What happens to the muscles of the diaphragm the external intercostal muscles and the position of diaphragm during inspiration and expiration ?​

Answer 1

Answer:

The diaphragm is drawn down and the ribs flared by the external intercostal muscles to increase the thoracic volume. The negative pressure created draws air into the lungs through the upper respiratory tract. In expiration the relaxing muscles allow the ribs to fall back and the diaphragm rises