How does microgravity affect us?

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Microgravity significantly impacts human physiology, particularly the cardiovascular system and heart functioning. One major effect is the weakening of bones due to loss of bone mass, a serious concern for astronauts. Additionally, muscles, including those in the heart, weaken from disuse in a microgravity environment. This reduction in muscle strength can lead to challenges for astronauts upon returning to Earth, as their hearts may struggle to pump blood effectively after adapting to the lower demands of microgravity. Ongoing studies on the International Space Station aim to gather more data on these effects and their implications for human health in space.
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How does microgravity affect us, in paricular our cardiovascualar system and heart functioning?
 
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One well known effect is that under microgravity, bones start to weaken.
 
The effects of microgravity on human physiology is one of the things being studied on the International Space Station. I'd have to check around to see what the latest data area, but as Monique said, there is a loss of bone mass (very serious concern). Also, muscles weaken from lack of use (something which can be fixed).
 
How does microgravity affect functioning of our heart?
 
Based on Phobos' reply, I would assume that the muscles in the heart would also become weakened due to the reduced effort required to pump blood around the body.. so a returning pilot may have difficulties once back on earth.
 

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