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What is the effect of the diaphragm depression and the expansion of the rib cage inside the lungs?
Wiki User
∙ 12y ago
When the diaphragm depresses and the rib cage expands, it increase the volume of the chest cavity. Actually, the rib cage doesn't really expand. The sternum (breastbone) move up and out slightly, moving the ribs slightly with it. This creates a pressure gradient where there is very low pressure in the lungs and higher pressure out. As a result of this gradient, air is almost sucked into the lungs, like air filling a vacuum space. As the diaphragm contracts and gravity pulls the ribs and sternum back down, the air is forced out of the lungs.
Wiki User
∙ 12y ago
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What effect does the depression of the diaphragm and the expansion of the rip cage and its pressure inside the lungs?
When the diaphragm depresses and the rib cage expands, it increase the volume of the chest cavity. Actually, the rib cage doesn't really expand. The sternum (breastbone) move up and out slightly, moving the ribs slightly with it. This creates a pressure gradient where there is very low pressure in the lungs and higher pressure out. As a result of this gradient, air is almost sucked into the lungs, like air filling a vacuum space. As the diaphragm contracts and gravity pulls the ribs and sternum back down, the air is forced out of the lungs.
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