The receptors of the retina that allow vision in dim light are the
Correct answer: B. rods
- A. cones
- B. rods
- C. ganglion cells
- D. cells of the blind spot
Explanation
Rods contain the pigment rhodopsin, which is broken down by very low light intensities, and several rods share one sensory neurone so their effects add up, making them extremely sensitive. The price of that pooling is poor detail and no colour discrimination, which is why night vision is grey and blurred. Cones need bright light and give sharp colour vision instead.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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