The are tubular, fluid-filled structures that provide information about head rotations and movements.

The correct answer will be- semicircular canals of ear

Explanation:

The body balance, position and motion are sensed by the vestibular system present in the inner ear.

The vestibular system comprises of three tiny fluid-filled semicircular canals attached to two membranous sacs (otolith organs) called utricle and saccule.

The semicircular canals are oriented with each other at right angles due to which it senses the direction of the speed and direction of the angular motion. With the movement of the head, the semicircular canal liquid sloshes around and move the surrounding hairs of the otolith organs.  

Thus, semicircular canals of the ear are the correct answer.

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