In the cochlea, what is the primary function of the hair cells located at the top of the rods?

The hair cells located at the top of the rods in the cochlea play a crucial role in the auditory system by detecting sound vibrations. These cells are the sensory receptors that convert mechanical stimuli caused by sound waves into electrical signals. When sound waves enter the cochlea, they create fluid movement that causes the hair cells to bend. This bending stimulates the hair cells to fire electrical impulses, which are then transmitted to the brain via the auditory nerve. The accuracy of this conversion is essential for our ability to perceive different pitches and volumes of sound, making the detection of sound vibrations the primary function of hair cells in this context.