Photoreceptors (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the primary function of photoreceptors in the retina?
What is the primary function of photoreceptors in the retina?
Convert light to electrical energy
Approximately how many rod cells are present in each human eye?
Approximately how many rod cells are present in each human eye?
120 million
What type of vision do rod cells provide?
What type of vision do rod cells provide?
Black and white vision
How do multiple rod cells connect to the nervous system?
How do multiple rod cells connect to the nervous system?
Multiple rods to single bipolar cell
Which photoreceptor type provides better visual acuity?
Which photoreceptor type provides better visual acuity?
Cone cells
Approximately how many cone cells are in each human eye?
Approximately how many cone cells are in each human eye?
6 million
How many types of cone cells exist and what pigment do they contain?
How many types of cone cells exist and what pigment do they contain?
Three types with iodopsin
What light conditions do cone cells require to function effectively?
What light conditions do cone cells require to function effectively?
High-intensity light
What is the composition of photoreceptors at the fovea?
What is the composition of photoreceptors at the fovea?
High cone density, no rod cells
Where are rod cells mainly distributed on the retina?
Where are rod cells mainly distributed on the retina?
Around the periphery