The cessation of dark current closes Na+ channels, hyperpolarizing the photoreceptor, which then does not inhibit bipolar cells; bipolar cells then release excitatory neurotransmitters.
L'absence de courant noir ferme les canaux Na+, hyperpolarisant le photorécepteur, ce qui l'empêche d'inhiber les cellules bipolaires ; les cellules bipolaires libèrent alors des neurotransmetteurs excitateurs.
| Front | How does lack of dark current affect the interaction b/w photoreceptors and bipolar cells? |
|---|---|
| Back | 1. Na+ channels close as a result of less cGMP which hyperpolarizes the photoreceptor 2. Hyperpolarized photoreceptor can no longer inhibit the bipolar cells 3. Bipolar cells now free to release excitatory NT |
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