Discussion
It has been observed that the astronauts lose substantial quantity of calcium through urine during space flight. This is due to _______.
Answer: B
The calcium loss is due to microgravity.
On Earth, bones are constantly loaded by body weight, which stimulates bone formation. In the near-weightlessness of orbit that load disappears, so bone breaks down faster than it is rebuilt, especially in the weight-bearing bones of the legs, hips and spine. The calcium released from bone is excreted in the urine, which also raises the risk of kidney stones.
Astronauts counter it with daily resistance exercise. Hypergravity is the opposite condition, and diet or outside temperature are not the cause, since the astronauts live in a temperature-controlled cabin.
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