Kaplan Nursing Entrance Practice Exam 2025 – The All-in-One Guide to Exam Success!

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What primary function do rods serve in the visual system?

Detect color

Respond to low-intensity light

Rods are specialized photoreceptor cells located in the retina that play a crucial role in vision, particularly in low-light conditions. Their primary function is to respond to low-intensity light, making them essential for night vision and peripheral vision. Rods are incredibly sensitive to light and allow us to see in dimly lit environments, but they do not mediate color vision; that function is served by cones, another type of photoreceptor. Unlike cones, rods are not capable of detecting bright light or providing high-resolution images. This unique characteristic of rods enables them to be more effective in low-light scenarios, highlighting their importance in visual perception under such conditions.

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Detect high-intensity light

Enable color discrimination

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