题目内容
Skeletal system refers to the framework of bones and _____ which can protect our organs and allow us to move.
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Red marrow in certain bones can prduce blood cells, which is called ______.
Long bones consist of a _____ and a variable number of epiphyses.
The texture of short bones is _____ except at the surface, where there is a thin layer of compact bone.
Examples of flat bones do not include _____.
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