Photoreceptors (AQA A-Level Biology): Flashcards
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Function of photoreceptors
Function of photoreceptors
Convert light energy to electrical energy (transducers)
Two main types of photoreceptors
Two main types of photoreceptors
Rod cells and cone cells
Number of rod cells per human eye
Number of rod cells per human eye
120 million
Light intensity rod cells detect
Light intensity rod cells detect
Low-intensity light
Type of vision rod cells provide
Type of vision rod cells provide
Black and white only
Number of cone cells per human eye
Number of cone cells per human eye
6 million
Light intensity cone cells require
Light intensity cone cells require
High-intensity light
Number of cone cell types
Number of cone cell types
Three distinct types
Photoreceptor distribution at the fovea
Photoreceptor distribution at the fovea
High cone concentration, no rod cells
Visual acuity of rod vs cone cells
Visual acuity of rod vs cone cells
Rods: poor; Cones: excellent