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spaceflights can make the heart shrink in mass

The heart is remarkably plastic. So the heart adapts to the load that’s placed on it and In spaceflight, one of the things that happens, is you no longer have to pump blood uphill, because you’re not pumping against gravity .Spending very long periods of time in space has something in common with extreme endurance swimming both can cause the heart to shrink. The heart adaptations, however, aren’t long-term – both men’s hearts returned to normal once they were back on terra firma. But chambers in the heart known as the atria expand in space, in part because of changes in the way fluid passes through

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