observe the movement of ribs inhalation and exhalation
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When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
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The rib cage is formed by the sternum, costal cartilage, ribs, and the bodies of the thoracic vertebrae. The rib cage protects the organs in the thoracic cavity, assists in respiration, and provides support for the upper extremities. During inspiration the ribs are elevated, and during expiration the ribs are depressed.
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