The pain receptors are called as noniceptors that are known to exist in muscle, joints, ad skin. A noxious stimulus is known by receptors that are located on the cell membrane of the sonsory nerve ending.
Hair cells are the sonsory receptors of both the auditory system and vestibular system in the the ears of all vertebrates and lateral line organ of fishes.
During vision, rod and cone phoroceptors respond to light intensity and color.
Answer - Option 1 - bare dendrites of sensory neurons
