Question

what are hair cells?
cells that respond to movement to send signals to the brain
cells that help in digestion
cells that produce hair on the scalp
cells that produce hair on surface of the skin
cells that regulate body temperature

Explanation:

Hair cells are sensory cells in the auditory and vestibular systems. They respond to mechanical movement (such as sound - waves or head - movement) and convert this mechanical energy into electrical signals that are sent to the brain for interpretation.

Answer:

Cells that respond to movement to send signals to the brain