Questions and Answers
What is the role of the cones in human retinas?
Detecting shades of green and red
What happens in individuals with red-green color blindness?
Their red and green cone pigments are abnormal
What is the cause of cataracts?
Accumulation of proteins in the lens tissue
Which factor is NOT associated with cataracts?
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What is the main effect of macular degeneration?
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Which type of cones respond maximally to light at 531 nm wavelength?
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What is the molecule that serves as the light-sensitive part of photopigments?
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What happens to the photoreceptor cell when exposed to light of an appropriate wavelength?
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What happens to guanylyl cyclase in the absence of light?
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What is the function of opsin in photopigments?
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How does a photoreceptor cell differ in state between darkness and light exposure?
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What maintains ligand-gated cation channels open in the dark?
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What is the responsibility of specific ascending pathways in the central nervous system?
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What distinguishes nonspecific ascending pathways in the central nervous system?
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What characterizes polymodal neurons involved in nonspecific ascending pathways?
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Where do the central processes of afferent neurons synapse in the brain or spinal cord?
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What happens when the central processes of afferent neurons converge in the central nervous system?
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What is the significance of association areas in the cerebral cortex?
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