The short answer to your question is that when
the messages from your eyes and the messages from
your inner ear dont match up, you feel sick.
You know that we hear with our ears, but the
inner ear also has sensors that tell our brain our
orientation (standing up, leaning over, lying
down, etc.) and our movement. The semi-circular
canals do this job. They are filled with fluid.
When the fluid moves, it pushes on sensory hairs.
These hairs send messages to our brain. Take a
clear bottle of water and move it around. You can
see the general idea.
When were on a boat,
our inner ear tells our brain that were bobbing up
and down with the waves. But if were looking at
the inside of the boat, it looks still. If were
up on deck, the horizon is still.
knows exactly why our brain responds to the two
different messages by making us feel sick, but
maybe its because when our senses are acting
strange, we may have consumed something poisonous,
and vomiting is how our body gets rid of the bad
Astronauts sometimes have a problem
like seasickness. Can you figure out why?
Thanks for asking.
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