Astronauts can lose up to two liters of blood volume to their heads in space
Living in microgravity causes a dramatic shift in bodily fluids that can move up to two liters of blood toward an astronaut's head, leading to significant physiological changes.
In the weightless environment of space, blood and other fluids that normally pool in the legs relocate upward toward the torso and head. This shift can move up to two liters of fluid, causing increased intracranial pressure and vision impairment in roughly 30 percent of astronauts.
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