An osteon has (a) a central canal carrying blood vessels, (b) concentric lamellae, (c) osteocytes in lacunae, (d) canaliculi that connect lacunae to the central canal, (e) all of these.
The organic portion of matrix is important in providing all but (a) tensile strength, (b) hardness, (c) ability to resist stretch, (d) flexibility.
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