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Diaphragm & interna intercostal muscle
the intercostal muscles and the diaphragm
The diaphragm and external intercostal muscles are primarily involved in changing the thoracic volume during breathing. The diaphragm contracts during inhalation to increase thoracic volume, while the external intercostal muscles help lift and expand the rib cage.
The intercostal muscles, (muscles between the ribs), contract.
The main muscle used is the diaphragm. Also, the intercostal muscle.
Inspiratory muscles such as the diaphragm and external intercostal muscles contract to increase the volume of the thorax. This action lowers the intrathoracic pressure, allowing air to rush into the lungs during inhalation.
The diaphragm (a sheet of muscle underneath the ribcage) and intercostal muscles (located between your ribs).
Inspiration is due to the contraction of the diaphragm and external intercostal muscles.
Children normally use their diaphragm and intercostal muscles to breathe. The diaphragm is the main muscle responsible for breathing, while the intercostal muscles help expand and contract the chest cavity during respiration.
intercostal muscle
diaphragm
Almost all skeletal muscles are voluntary. But respiratory muscles, diaphragm and intercostal, are not completely voluntary.