In mammals, the semicircular ducts of the vestibular system participate in responses to changes in position and movement of the head.Which of the following statements about the semicircular ducts is true?

Question

Quizplus · Accepted Answer

The movement of fluid within the semicircular ducts bends the hair cell stereocilia by pushing on a gelatinous cupula covering the hair cells. This bending of the hair cell stereocilia is what signals changes in head movement and position to the brain. The semicircular ducts are located in the inner ear and are filled with fluid, but they do not have direct openings to the external environment. Mammals actually have three semicircular ducts (one for each plane of motion). Otoliths, which are tiny calcium carbonate crystals, are found in the utricle and saccule of the inner ear, not in the semicircular ducts.

In Mammals, the Semicircular Ducts of the Vestibular System Participate