Spinning around in endless circles causes dizziness or vertigo because hair-like sensory nerve cells in our ears send wrong messages to our brain. The motions of our bodies are detected by the vestibular system found in the upper part of our inner ear. The vestibular system senses whether we are standing up or lying down. When we spin in circles or get up too fast from the couch, we feel dizzy and lightheaded due to the vestibular system's nerve reactions to these unusual motions. The vestibular system senses motion through three semicircular canals;not only do these canals have hair-like sensory nerve cells, but they also contain a fluid called endolymph which resists changes in motion. As a result of this resistance, the endolymph lags behind and stimulates hair cells to send nerve signals to the brain. Our brain interprets the nerve messages and knows which direction the head moved. However, when we spin, our brain receives mixed messages. The endolymph slowly begins to move in the same direction we are spinning. As time goes by, the endolymph catches up to the rate of speed we are spinning and no longer stimulates the hair-like nerve cells. This causes our brain to quickly adapt to the nerve signals, but when we stop spinning, the endolymph continues to move and stimulates hair cells in the opposite direction. These hair cells send wrong messages to the brain making it think that the head is still spinning although it actually has stopped. As a result of this inaccurate signal, we experience dizziness. Eventually, the endolymph stops moving and no more signals are sent to the brain. The brain interprets that the spinning motion has ceased and the dizziness disappears.
2006-09-02 01:19:59
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answer #1
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answered by uknative 6
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When you spin, the endolymph slowly moves in the direction you are spinning. The movement of the endolymph signals the brain that the head is spinning. The brain quickly adapts to the signal because the endolymph begins to move at the same rate that you are spinning and no longer stimulates the hair cells. However, when you stop spinning, the endolymph continues to move and stimulate hair cells in the opposite direction. These hair cells send signals to the brain. The brain determines that the head is still spinning, even though you have stopped. This is where the dizzy feeling comes from. Eventually, the endolymph stops moving, no signals are sent to the brain, your brain determines that your motion has stopped, and you no longer feel dizzy.
2006-09-02 08:25:09
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answer #2
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answered by SONIA 2
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Its the balance mechanism of the ear causing this effect as we have fluid filled sacks which give our brain messages on our position in a space at any given time. When we spin inertia cause the fluid to move, altering the brains balance mechanism. So when we stop the brain is still compensating for the movement which cause us to feel dizzy. Something like that I think
2006-09-02 08:19:58
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answer #3
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answered by ? 3
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Our sense of balance comes from a liquid in the cochlea in the ear, which, in tandem with a set of neurotransmitters going to the brain, tell us which way is up, down, on the right and left sides. Spinning, then stopping means that the liquid still revolves around inside, transmitting the wrong message of continued movement, thus, the message and your head gets scrambled. Do not worry, though, the head easily 'unscrambles' after a few moments...
Whirling Dervishes, a sect or branch of Sufism and Islam, do a sacred whirling dance, spinning round and round in order to experience a sense of being "in the unified centre of everything and nothing at the same time". They maintain balance, against all odds, by concentrating on one hand held higher up: it is likely that they 'short-circuit' their cochlea's scrambled messages by using a differerent part of the brain to assess their position and physical orientation.
2006-09-02 08:26:33
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answer #4
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answered by Anonymous
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The fluid in the inner ear is dislodged by the centrifugal force and hence makes balance difficult. You can focus on a particular point whilst turning, this will help to minimise the dizziness.
2006-09-02 08:27:30
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answer #5
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answered by biggi 4
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because your brain inside your skull moves around and the nerves to your eyes make you lose control of your sight for a bit. its hard to focus when your spinning round. x
2006-09-02 13:21:25
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answer #6
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answered by ms_jaffa_cake 2
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Rapid movement of the fluid in the semicircular canals, the organ in the ears of balance.
2006-09-02 08:17:14
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answer #7
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answered by Anonymous
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The fluid in the ear swishes around and throw's your sense of balance out.
2006-09-02 08:18:01
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answer #8
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answered by Anonymous
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You've overstimulated the semi-circular canals in your ears and thus, that giddy, swirling sensation is caused
2006-09-02 08:17:37
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answer #9
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answered by Anonymous
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what an interesting question well to me and cool answers people I never knew that I learn something everyday lol
2006-09-02 08:22:30
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answer #10
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answered by Anonymous
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