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The human diaphragm, if I one of God's neat little tricks. It's a tough, broad sheet of muscle, modest in thickness, that acts both as a barrier between the abdominal and thoracic cavities, but also as a vacuum assist device for breathing. When you take a deep breath, the chest wall and abdominal muscles expand the chest cavity, and the diaphragm moves outward and downward, drawing air into the lungs. It's also a favorite subject for pimping medical students --- what water fowl cross the diaphragm? … read more

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