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Answer:
We know that all humans have five senses these are sight, taste, smell, hearing and touch. But actually, there is a “sixth sense” which is known as vestibular system.
Vestibular system helps us to sense our body movement combined with our ability to maintain body balance. A body has ability to sense and determine in which direction and with which speed the body is moving and with the help of this information body can maintain its balance. A blind man rely on his vestibular sense for this information. Body vestibular system is designed to work on the ground. So in space it can provide erroneous or disorienting information. Astronouts are trained for adaptation strategies to enter in a microgravity environment. When astronouts return back to earth in normal environment they feel dizziness and disorientation.
The astronauts experienced dizziness upon their arrival in space.
The vestibular system is vital as it provides a sense of balance and information about the position of the body. From the complete question, when the astronauts arrived in space, they had sensations of dizziness and disorientation.
When they got back to the Earth, they had difficulties standing and stabilizing their gaze. In this case, their sense of balance and coordination hasn't adapted back to normal conditions.
This informs researchers that the vestibular system adapts to changing conditions.
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