Question

Which muscles are activated during forced expiration? a) the scalenes, sternocleidomastoid, and pectoralis minor muscles b) the diaphragm and external intercostal muscles c) the diaphragm and internal intercostal muscles d) the internal intercostal, oblique, and transversus muscles.

Answer 1

The muscles involved in forced expiration are the internal intercostal muscles, as well as the oblique and transversus abdominal muscles, which compress the rib cage and reduce the volume of the thoracic cavity to expel air.

Step-by-step explanation:

The muscles activated during forced expiration are primarily the internal intercostal muscles and various abdominal muscles. Specifically, during forced expiration, the internal intercostal muscles help to compress the rib cage by drawing the ribs together, which decreases the thoracic cavity volume. Additionally, the accessory muscles of the abdomen, which include the oblique and the transversus muscles, contract to force the abdominal organs upward against the diaphragm, pushing it further into the thorax and expelling more air out of the lungs. Therefore, the correct answer to the question is d) the internal intercostal, oblique, and transversus muscles.

Answer 2

The internal intercostal, oblique, and transversus muscles are activated during forced expiration.

Step-by-step 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.