B. Balance: Balance or equilibrium is controlled by the semicircular canals of the inner ear. Each of the three canals is oriented along one of the 3 dimensions of the body (the x, y and z axes), so motion in any direction is felt when the fluid inside the canals triggers tiny hairs on the inside. The brain integrates this information into a sense of balance.
i. Balance and Vision: Have a person stand on both feet without moving while their eyes are closed. Then have them balance on one foot with their eyes closed. Finally have them walk a straight line with their eyes closed. How does vision work in concert with the sense of balance? Can you see why people are asked to walk a straight line to test sobriety?