What do sensory receptors in the vestibular sacs help maintain?

Sensory receptors in the vestibular sacs play a crucial role in maintaining balance. The vestibular system, located in the inner ear, includes structures such as the vestibular sacs (utricle and saccule) that are sensitive to changes in the position of the head relative to gravity. These receptors detect linear accelerations and static positions, sending signals to the brain that help it understand the body's orientation and movement.

This information is vital for coordinating bodily movements and maintaining equilibrium. When the head moves, the fluid within the vestibular sacs shifts, causing the hair cells within them to bend. This bending generates a nerve impulse that informs the central nervous system of the current position and motion of the head, allowing for adjustments to be made to keep the body balanced. Thus, the correct answer highlights the essential role of vestibular sacs in the maintenance of balance.