Photoreceptors Practice Test

Which photoreceptor type tends to have more photoreceptors connected to a single post-synaptic bipolar cell?

Cones Both equally Neither Rods

Correct Answer:

Rods

Explanation:

Convergence in the retina shapes how much light from many photoreceptors is pooled into a single bipolar cell. Rods have high convergence: many rods feed into relatively few rod-bipolar cells. This pooling boosts sensitivity in dim light, but it reduces spatial detail. Cones, especially in the fovea, connect more sparsely, often near one-to-one with bipolar cells, preserving high acuity and color discrimination. So the photoreceptor type that tends to have more photoreceptors connected to a single post-synaptic bipolar cell is rods.

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