Explain the principle of the vestibular apparatus.

The vestibular apparatus is represented by semicircular canals located in three mutually perpendicular planes, filled with liquid, in the walls of which there are receptors and crystals of calcium carbonate. When the position of the head changes, the crystals act on the receptors, and the impulses enter the brain, in response the cortex sends impulses to the skeletal muscles to restore balance.

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