Your Lungs are two spongy, saclike organs inside your chest, that hold air. The lungs hold air while oxygen and carbon dioxide are exchanged.
Your Diaphragm is a dome-shaped muscle that divides the chest cavity from the abdominal cavity. It moves down to increase the depth of your chest cavity during inhalation, while your ribs move outward to widen the space so that air will rush into the lungs. During exhalation, the diaphragm moves up and the ribs move in, squeezing the air out of the lungs.
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