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______ are receptor cells contained in the retina and are useful in color perception, particularly in bright-light conditions.

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BlackTom AI · Accepted Answer

The prompt asks us to identify the retinal receptor cells that support color perception in bright light.
Option 1: 'Receptor cells' is overly broad and vague; while cones are receptor cells, this option does not specify the type responsible for color vision, and thus lacks the precision needed.
Option 2: 'Rods' are photoreceptors specialized for low-light vision and grayscale perception; they do not convey color and perform poorly in bright light, so this choice contradicts the color-perception requirement.
Option 3: 'Cones' are the photoreceptors that enable color vision and function optimally in bright illumination; they come in different spectral sensitivities (short, medium, and long wavelengths) which together allow color discrimination, aligning with the description.
Option 4: 'Bipolar cells' are interneurons in the retina that transmit signals from photoreceptors to ganglion cells; they are not themselves receptor cells and do not directly mediate color perception, so this choice mislabels the cellular role.
In summary, the description points to cones due to their specific role in color vision under bright light, whereas the other options either describe non-specific receptor categories, different photoreceptor types geared toward other lighting conditions, or non-receptor retinal neurons.

Blank ______ are receptor cells contained in the retina and are useful in color perception, particularly in bright-light conditions.

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