Microgravity causes an upward shift of fluid within the body. This redistribution of fluid can lead to a thinning of the legs and swelling of the face. Eventually, the body’s baroreceptors detect the imbalance and convert some blood into urine to reduce swelling. As a result, when astronauts return to Earth, they have less blood than needed. Some require recovery time to regain their strength and rebuild their fluid levels.
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