Light causes cis-retinal to convert to trans-retinal, activating opsin, and a cascade that reduces cGMP, closing Na+ channels and stopping dark current.
La lumière provoque la conversion du cis-rétinal en trans-rétinal, l'activation de l'opsine, et une cascade qui réduit le cGMP, fermant les canaux Na+ et arrêtant le courant noir.
| Front | Why does dark current stop with light? |
|---|---|
| Back | 1. Cis retinal changes to trans-retinal and activates opsin 2. Activated opsin triggers cascade of events (PDE converts cGMP to GMP) that reduces levels of cGMP 3. With less cGMP, Na+ channels close and dark current ceases |
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Bipolar photoreceptor cells lack dark current affect interaction
Previous card: Cells bipolar ganglion affect cells? inhibited prevented releasing
Up to card list: Anki Anatomy, physiology, microbiology