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4.1 identify photoreceptor cells as those containing light sensitive pigments and explain that these cells convert light images into electrochemical signals that the brain can interpret
identify photoreceptor cells as those containing light sensitive pigments and explain that these cells convert light images into electrochemical signals that the brain can interpret
- Photoreceptor cells contain light sensitive pigments. These cells convert light into electrochemical signals that the brain can interpret. An electrochemical signal consists of a wave of sodium and potassium ions which move across the cell membrane of the neurone.