Describe how semicircular canals performs their functions

Answer:

- There are three semi- circular canals, arranged in planes at right angle to each other. They contain receptors that respond to rotation of the head in any of the three planes.
-The receptors are located in an enlarged part of each semicircular canal called ampulla. Each ampulla has a cone shaped projection called cupula. Cupula is suspended by hairs that arise from sensory cells. The movement of the body
in a given direction causes movement of the fluid in at least one canal in opposite direction. This deflects the cupula in the direction opposite to direction of movement of the head.
- This distorts the hairs of the sensory cells leading to generation
of impulses in the neurons that are connected to the sensory cells. The impulses are transmitted to the brain via the auditory nerve where they are interpreted.

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