When do rods mostly shed their outer segment discs?

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Multiple Choice

When do rods mostly shed their outer segment discs?

Explanation:
Rods constantly refresh their outer segments through a daily cycle of disc shedding and renewal. New discs form at the base, while older ones are shed from the tip and cleared by the retinal pigment epithelium. This turnover follows a circadian rhythm, with the peak shedding aligning with daytime light exposure. The daytime period provides the cues and metabolic context for efficient phagocytosis by the RPE, so the majority of outer-segment disc shedding occurs then. At night, the rate is lower, though some renewal still occurs. Therefore, daytime is when rods mostly shed their outer segment discs.

Rods constantly refresh their outer segments through a daily cycle of disc shedding and renewal. New discs form at the base, while older ones are shed from the tip and cleared by the retinal pigment epithelium. This turnover follows a circadian rhythm, with the peak shedding aligning with daytime light exposure. The daytime period provides the cues and metabolic context for efficient phagocytosis by the RPE, so the majority of outer-segment disc shedding occurs then. At night, the rate is lower, though some renewal still occurs. Therefore, daytime is when rods mostly shed their outer segment discs.

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