28. Would we have to do anything to help keep our blood running? (A K2S Question)

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The circulation of the blood continues to run in space, but the control of blood flow does change. This is because the heart no longer has to pump against the pull of gravity to move blood around the body. When astronauts return to Earth they sometimes can feel light-headed and even faint until their hearts get used to being back on Earth. This usually takes a day or two.

Answer provided by Col. USAF Dr. Richard S. Williams


Image:K2S logosmall.jpg Question and Answer extracted from the book Kids to Space - by Lonnie Schorer


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