Did you know: The blood in the astronaut's body flows differently when in space

 Yes, their hair is standing on end, but there's something else - something you won't be able to touch with your hand. If you look closely at their faces, you'll see bulging blood vessels in their neck or face. The cause? Because of gravity. More precisely because there is no gravity.

Our bodies have evolved to adapt to Earth's gravity, so normal activities like going to the supermarket or playing with pets will help our body functions to be maintained in a healthy way. strong, like a car that is periodically oiled. When you put your body in microgravity, everything changes. According to NASA, when there is no normal gravity, our body is not affected by external forces, so the heart and blood vessel system begins to become … 'lazy'.

On Earth, gravity pulls blood and other bodily fluids down into the abdomen and legs. That's why when standing for a long time, the legs and ankles will swell. But because in that zero-gravity space - whether artificial or natural - blood instead of going down is pushed up to the chest and head. The displacement of body fluids causes the heart and blood vessels to receive a lower blood flow than usual, which in turn leads to bulging blood vessels in astronauts.

Daily health check is a must-do activity for astronauts on the ISS.

Zero gravity has a significant impact on the body and circulatory system. NASA and other space agencies around the world have spent a lot of time and effort researching the consequences of zero gravity, in order to remedy the effects that living in space can have. for the human body.

According to NASA, blood in the chest and head can lead to negative health effects, such as hearing loss, increased brain pressure leading to cerebral edema, and eyeball deformity (or Neuro-Eye Syndrome). related to space travel, SANS). The lack of gravity also causes muscles to atrophy, and the heart shape changes from oval to spherical.

When the astronauts returned to Earth, blood and body fluids were pulled down the abdomen and legs as before. This shift, and other changes to the body, make it difficult for the body to control the drop in blood pressure. As a result, some astronauts will experience shock and sometimes fainting - a condition known as 'standing hypotension'.

Our body is a wonder, as it can adapt to any environment. Even so, space is clearly not a truly human-friendly environment!