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The feeling of weightlessness that astronauts experience is the absence of what force?
- Weight of their body
- Gravitational force
- Magnetic force
- Centripetal force
Astronauts orbiting in space feel a sense of weightlessness because there is no gravitational force in space pulling upon their bodies.
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Astronauts sometimes get confused with the direction of up and down. Which system in the body is responsible for this?
- Endocrine system
- Spinal system
- Vestibular system
- Lymphatic system
The vestibular system, in vertebrates, is a sensory system that creates a sense of balance and spatial orientation for the purpose of coordinating movement with balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of the inner ear in most mammals.
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What kind of bodily changes occur to astronauts when they are in space?
- Loss of calcium
- Increase in height
- Anaemia
- All of the above
There is a progressive loss of body weight and bone calcium during space flights. In outer space, bodily fluids are redistributed, with less in the lower extremities and more in the upper body; height increases; body mass usually, but not always, decreases with a loss of muscular tissue; the veins and arteries of the legs become weaker; and anaemia occurs, accompanied by a significant reduction in blood count.
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