Each analyzer contains receptors that respond only to their specific stimulus.
For example, the receptor portion of the auditory analyzer consists of hair cells. When stimulated (i.e., sound), the hairs on the surfaces of cells are displaced, an impulse arises, which is transmitted to the brain. Such cells will not react to light.
The receptors of the visual analyzer are special cells of the rod and cone. The former react to illumination, the latter to the color of objects. The sound is invisible, so the eyes cannot recognize it.
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