Question

4 Which muscles are actively involved in normal breathing?

Answer 1

The main muscles are the diaphragm and intercostal muscles, but the muscles in the neck and the abdominal muscles also help.

Step-by-step explanation:

The diaphragm is the muscle under the lungs that helps move the lungs while the intercostal muscles are the muscles in between the ribs.

Answer 2

The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.