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Questions and Answers
What is the main function of cones in photopic vision?
What is the main function of cones in photopic vision?
- Regenerating photoreceptor cells
- Sending signals directly to the brain
- Sensing light in the periphery
- Detecting color and providing detailed vision (correct)
What percentage of the brain is dedicated to the 6 million cones?
What percentage of the brain is dedicated to the 6 million cones?
- 50%
- 10%
- 75%
- 25% (correct)
How many photoreceptor cells are there in total in the human retina?
How many photoreceptor cells are there in total in the human retina?
- 150 million
- 126 million (correct)
- 120 million
- 100 million
What is the primary function of rods in scotopic vision?
What is the primary function of rods in scotopic vision?
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What is the ratio of rods to cones in the human retina?
What is the ratio of rods to cones in the human retina?
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Study Notes
Photopic and Scotopic Vision
- Photoreceptor cells consist of rods and cones, responsible for retinal stimulation.
Photoreceptors: Rods and Cones
- Cones are specialized for: • Color vision • Detail vision • Fovea (central part of the retina)
- Rods are sensitive to: • Light • Periphery (outer part of the retina)
Characteristics of Photoreceptors
- Total number of receptors: 126 million
- Rods: 120 million (95%)
- Cones: 6 million (5%)
- Brain allocation: 25% of the brain is dedicated to processing information from 6 million cones.
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