why do astronauts excrete out substantially higher amount of calcium in their urine as they go to a space flight?
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Calcium Absorption, Metabolism, and Excretion
This is hypothesized to be related to a loss of bone in response to unloading, and the release of calcium from bone, which suppresses parathyroid hormone. ... Urinary calcium excretion is also increased during flight (this will be addressed in greater detail below).
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