Question

Do hollow bones provide extra weight?

Answer 1

The large bones in our body are also hollow, which makes them strong so they can support more weight, but light, so it takes less energy to move them.

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Answer 2

How much lighter would a human be if we had hollow bones like in birds? about 10% lighter. most of our weight is muscle (water) and fat. bones are only about 20% of our body weight.

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so no they are actually much lighter