Answer:
Gravity
Explanation:
The hair cells within the utricle and saccule, which are parts of the inner ear's vestibular system, are primarily responsible for detecting linear acceleration and changes in head position with respect to gravity. These hair cells are sensitive to the movement of otoliths (calcium carbonate crystals) in response to changes in gravitational forces. As the head moves, the otoliths move, causing the hair cells to bend and send signals to the brain, providing information about the direction and magnitude of gravitational forces. Therefore, these hair cells play a crucial role in maintaining balance and spatial orientation by detecting gravity's influence on the body.
