Human bone does not contain
A. calcium
B. carbon
C. oxygen
D. phosphorous
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Oxygen
The marrow is extremely densely populated by various cell types (not just HSCs), so that the oxygen concentration drops steeply just microns away from feeding capillaries. ... The endosteal region, connective tissue that lines bones, by contrast, is less hypoxic, because it is perfused with more oxygen-carrying arteries.
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