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Human Spine |
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| Although individual vertebrae move little from one to the next, the human spinal column as a whole is a chain flexible enough to allow us to touch our toes. Its unique S-shape centers the weight of our long bodies over our feet, keeping us from toppling. Animals that walk on all four legs have straighter spines that provide even support for their horizontal bodies. | ||||||
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| Dorling Kindersley | ||||||
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| Back Pain; Human; Spinal Column | ||||||
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