Podcast
Questions and Answers
What is the role of the cones in human retinas?
What is the role of the cones in human retinas?
- Detecting shades of green and red (correct)
- Responding optimally to long wavelengths
- Producing loss of vision in the center of the visual field
- Coordinating eye and head movements
What happens in individuals with red-green color blindness?
What happens in individuals with red-green color blindness?
- Their blue cones respond maximally to light
- They have an opacity in the lens tissue
- Their red and green cone pigments are abnormal (correct)
- They lack blue cone pigments
What is the cause of cataracts?
What is the cause of cataracts?
- Mutation in genes encoding the cone pigments
- Impairment of the macula lutea region
- Accumulation of proteins in the lens tissue (correct)
- Trauma to the optic disc
Which factor is NOT associated with cataracts?
Which factor is NOT associated with cataracts?
What is the main effect of macular degeneration?
What is the main effect of macular degeneration?
Which type of cones respond maximally to light at 531 nm wavelength?
Which type of cones respond maximally to light at 531 nm wavelength?
What is the molecule that serves as the light-sensitive part of photopigments?
What is the molecule that serves as the light-sensitive part of photopigments?
What happens to the photoreceptor cell when exposed to light of an appropriate wavelength?
What happens to the photoreceptor cell when exposed to light of an appropriate wavelength?
What happens to guanylyl cyclase in the absence of light?
What happens to guanylyl cyclase in the absence of light?
What is the function of opsin in photopigments?
What is the function of opsin in photopigments?
How does a photoreceptor cell differ in state between darkness and light exposure?
How does a photoreceptor cell differ in state between darkness and light exposure?
What maintains ligand-gated cation channels open in the dark?
What maintains ligand-gated cation channels open in the dark?
What is the responsibility of specific ascending pathways in the central nervous system?
What is the responsibility of specific ascending pathways in the central nervous system?
What distinguishes nonspecific ascending pathways in the central nervous system?
What distinguishes nonspecific ascending pathways in the central nervous system?
What characterizes polymodal neurons involved in nonspecific ascending pathways?
What characterizes polymodal neurons involved in nonspecific ascending pathways?
Where do the central processes of afferent neurons synapse in the brain or spinal cord?
Where do the central processes of afferent neurons synapse in the brain or spinal cord?
What happens when the central processes of afferent neurons converge in the central nervous system?
What happens when the central processes of afferent neurons converge in the central nervous system?
What is the significance of association areas in the cerebral cortex?
What is the significance of association areas in the cerebral cortex?
