Sensitive

• Rods are very what?


  Sensitive to light - work well in dim light
• Which type of photoreceptor is very sensitive to light?

  rODS
• where do rods work well?


  in dim light
• Why are rods very sensitive to light?

  Because many rods join one neurone, so many weak generator potentials combine to reach the threshold and trigger an action potential
• Cones are what?


  Less sensitive than rods (bright light)
• Where do cones work best?

  in bright light
• Why are cones less sensitive?


  Because one cone joins one neurone, so it takes more light to reach the threshold and trigger an action potential