The internal intercostal, oblique, and transversus muscles are activated during forced expiration.
Explanation:
The muscle of respiration is also called the breathing Pump muscle. Those muscles which is attached to rib cage have inherent potential to cause a breathing action. The muscle which is helpful in expanding the thoracic cavity is called inspiratory muscles.
It helps in the process of inhalation. Those muscle which is helpful to compress the thoracic cavity is called expiratory muscle. There structure is same as other skeletal muscle.
