While breathing normally. The breath is caused by diaphragm muscle contraction. The diaphragm moves down low. While the muscle between rib thaepnok contraction cause rib raised the volume in the chest cavity increases. The pressure of air within the lungs, decreased. The air flow into the lungs is: A. section 6-8 images breathe out occurs after the breath doiklam beef diaphragm relaxes. Diaphragm curves upward movement, or more. At the same time, the muscle between rib thaepnok taste. Make the lower rib of the air volume inside the chest cavity drops. The air pressure in the lungs, decreased. Air pressure in the lungs is greater than the air pressure outside the. The air moves from the lungs to the external image B 6-8.
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