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Effects on the body of being weighless
Effects on the body of being weighless, Shortly after leaving Earth's atmosphere, the absence of gravity causes the astronaut's height to increase by two or three centimeters. This is due to stretching of the vertebral column, which is no longer being pressed together by the downward pull of gravity. For the same reason, blood and other fluids migrate from the legs to the upper part of the body. The face swells, like it does after a prolonged headstand in the gym, and the veins of the neck protrude. Most astronauts initially feel disoriented because their senses are no longer able to tell them what is 'up' and what is 'down' – a distinction that has no relevance in space. This condition, known as space motion sickness or space adaption syndrome, can last for several days in susceptible individuals.
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