Or
.- if the condition for a long time to make the muscle exertion of gravity less than normal. Muscle atrophy and body fluids, moving from the lower part to the upper body. The astronauts must exercise regularly.No muscle atrophy. System help pump blood work, as well as when normal
.- state pressure and high temperature. External pressure lower than the pressure in the body the blood tube crack and death. The space also has a high temperature and full of various radiation
.- in weightless blood will flow from the legs up the brain more and more. It affects the neck size larger.
- obstacles of astronaut in weightless. The other is the difficulties in everyday life
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