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B
Sacculus
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C
Semicircular ducts
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D
Cochlea
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Solution
The correct option is C Semicircular ducts
Semicircular ducts or canals are three semi-circular and interconnected tubes present in inner ear. These are a part of bony labyrinth. They contain a fluid called endolymph. Their base is swollen and called ampulla which contains a projecting ridge called crista ampullaris. It contains hair cells having cytoplasmic projections on the apical end called stereocilia. Crista contains receptors that sense movements in body and maintain dynamic equilibrium.