The human body has been conditioned to survive on earth so when we leave it a lot of changes occurs to our bodies due to zero gravity in space. Going to space may be a lot fun but it has some of its shortcomings. Most of our vital body organs are usually affected and that's why astronauts may take weeks or even months before readjusting to normal conditions when they land back to earth's surface. The following body organs are affected.
Many astronauts suffer from some vision loss. The reason behind this is not yet determined but many believe it's because of the increased pressure in the head. Also cosmic rays which are absorbed by our atmosphere causes momentary flashes of light that may affect vision.
Astronauts become a little taller in space. This is because gravity on earth compresses our spine. In zero gravity, space between the vertebrate and the spine is able to expand hence the tallness.
Blood is normally pulled towards the feet by gravity on earth. In zero gravity, the opposite occurs thus blood is pulled towards the head giving astronauts puffy faces.
The brain cannot differentiate between up and down as our sense of orientation is disoriented hence it has to adjust. Also the sensors of balance are disoriented.
In space the heart doesn't have to work hard because minimum energy is used due to zero gravity. This may make the heart to shrink and eventually cause problem when astronauts come back to earth.
6. Muscles and Bones
In space muscles and bones aren't needed so much to hold our body hence they usually become weak. To overcome this, astronauts are usually advices to do regular exercises and go to gym available in the space station.
All in all, gravity in our planet is so essential for our lives and accounts for our normal living.
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