In a scotopic ERG, which photoreceptors contribute to the a-wave?

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Multiple Choice

In a scotopic ERG, which photoreceptors contribute to the a-wave?

Explanation:
Under scotopic (dark-adapted) conditions, the retina relies on the rod system. The a-wave is the initial negative deflection that reflects photoreceptor outer segment currents as light alters neurotransmitter release. Rods are the primary photoreceptors active in low light, so they dominate this early response and generate the a-wave. Cones are relatively inactive in the dark and contribute little to the a-wave under these conditions. The bipolar and ganglion cells are post-photoreceptor neurons that shape the later waves (like the b-wave), not the early a-wave. So the photoreceptors contributing to the a-wave in a scotopic ERG are rods.

Under scotopic (dark-adapted) conditions, the retina relies on the rod system. The a-wave is the initial negative deflection that reflects photoreceptor outer segment currents as light alters neurotransmitter release. Rods are the primary photoreceptors active in low light, so they dominate this early response and generate the a-wave. Cones are relatively inactive in the dark and contribute little to the a-wave under these conditions. The bipolar and ganglion cells are post-photoreceptor neurons that shape the later waves (like the b-wave), not the early a-wave. So the photoreceptors contributing to the a-wave in a scotopic ERG are rods.

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