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What part of our nervous system makes us experience the rolling motion while on a boat,...

What part of our nervous system makes us experience the rolling motion while on a boat, and why do we experience that sensation?

Science   Anatomy-And-Physiology   
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Answer #1

Rolling motion while on a boat is is also called as Motion Sickness.

Motion sickness is due to conflicting singals to brain by visual and vestibular system and proprioceptive system.

Otolith mainly responds to chang in gravity and head tilt.

Semicircular canal are mainly stimulted in rotational acceleration.

Sensory Signals from these travels via Vestibulochochlear nerve to the brain. Also brain recives signals from the eye. When we are in boat, due to up and down motion of boat due to waves of water, the vestibule recives it as vertical motion while eye percive a forward motion. When these senosory stimulus reaches brain, there occurs conflict and hence we percive it as Rolling motion and hence Motion sickness occurs. This leads to stimultion of CTZ area of brain and vomiting.

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