THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine. As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs. The intercostal muscles and neck muscles help move the rib cage and thus assist in breathing.

Detailed explanation-2: -The primary inspiratory muscles are the diaphragm and external intercostals.

Detailed explanation-3: -One, the diaphragm, lies at the base of the rib cage. Another, the external intercostals, lifts and expands the rib cage. The major muscle group for exhalation is made up of the internal intercostals. These muscles pull down on the rib cage and thereby push air out of the lungs.

Detailed explanation-4: -The diaphragm and the external intercostals are the muscles primarily responsible for inspiration. Additional muscles are recruited in active respiration. Quiet inspiration is a function of two muscles: Diaphragm: A musculotendinous domed structure that divides the thoracic and abdominal cavity.