Answer:
Hair cells in the crista ampullaris.
Explanation:
The structure called inner ear is responsible for the sensing balance and sense of circulation. The semicircular canal have ampulla that have a receptor structure known as the crista ampullaris. It is the structure that responds to spinning, hair cells present in the crista ampullaris sense these rotational movements.
Thus, the correct answer is : Hair cells in the crista ampullaris.
