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Two kinds of modified neurons comprise the visual receptors;

are more sensitive to light and function in dim light; they produce colorless vision.

provide sharp images in bright light and enable us to see in color.

The light-sensitive pigment in rods is

rhodopsin breaks down into a protein _ and _ in the presence of light

if all three sets are stimulated, the color is

if none are stimulated, the color is

The axons of ganglion cells leave the eyes to form the

Fibers from the medial half of the retina cross over in the