Which photoreceptors enable vision of high acuity and colour?

Question

BlackTom AI · Accepted Answer

Cones are responsible for high-acuity, colour vision.

1. Relevant knowledge points and concepts
- Two primary retinal photoreceptors: rods and cones.  
- Cones mediate photopic (daylight) vision, colour discrimination, and fine spatial resolution. There are three cone types (S, M, L) with different opsins tuned to short, medium, and long wavelengths.  
- Rods mediate scotopic (low-light) vision, are highly light-sensitive, contain rhodopsin, but do not support colour vision and have poorer spatial acuity.

2. Step‑by‑step reasoning
- Spatial acuity depends on receptor density and the degree of convergence onto bipolar and ganglion cells. In the fovea, cones are densely packed and often have near one-to‑one connections with bipolar and ganglion cells, producing small receptive fields and high spatial resolution.  
- Colour vision requires multiple photoreceptor types with different spectral sensitivities. The three cone opsins provide wavelength-dependent signals that the brain compares to perceive colour.  
- Rods, by contrast, are numerous outside the fovea and converge massively onto bipolar cells; this improves sensitivity but blurs spatial details and cannot provide spectral comparisons needed for colour.

3. (Calculations) No numerical calculation is required; the argument is anatomical and physiological.

4. Why the correct answer is correct
- Cones’ high density in the fovea, one‑to‑one wiring, and three distinct photopigments directly enable both high visual acuity and colour discrimination under well‑lit (photopic) conditions. These features are the mechanistic basis for the stated functions.

5. Why the other option is incorrect
- Rods are specialized for dim‑light sensitivity, not colour or fine detail. They lack multiple spectral opsins for colour discrimination and their high convergence reduces spatial resolution.

6. Conclusion
- Therefore the correct choice is b. Cones, which matches the provided answer.

Which photoreceptors enable vision of high acuity and colour?单项选择题

类似问题

Which statement about cone cells is TRUE?

A high concentration of what cell is found in the fovea centralis of the eye?

When fashion-conscious individuals purchase new clothes, it is important that they choose items that match in colour. Their ability to detect the colour of their clothes suggest which part of the retina is working properly?

Which cell is involved in color vision?

Name the Supreme Court decision that removed financial constraints on PACs.

Political scientists Joshua Kalla and David Broockman find that senior policy makers made themselves available to _____ between three and four times more often than they did to constituents.

Name the political scientist who argues that parties are designed to serve the needs of ambitious politicians (namely candidates and officeholders).

Name the political scientist who said this famous quote about the problems of pluralism: “The flaw in the pluralist heaven is that the heavenly choir sings with a strong upper-class accent.”

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单