Biology / Bio 2909 · Atom · ~20 seconds
Phototransduction: Rhodopsin and Hyperpolarization
Video not yet published
to the StudyWalks catalog
to the StudyWalks catalog
State
Light striking rhodopsin isomerizes its retinal component, triggering a cascade that closes sodium channels and hyperpolarizes the photoreceptor — the reverse of how most sensory neurons respond.
Show
This hyperpolarization removes the photoreceptor's steady inhibition of bipolar cells, exciting the ganglion cells that carry signal onward.
Watch for
Visual receptors hyperpolarize in response to their stimulus, opposite most other sensory receptors, which depolarize.