BIO NMDCAT Receptors

nmdcat.online July 7, 2026

During prolonged exposure to intense light, the intracellular concentration of cGMP in rod cells

A. Increases drastically

B. Remains completely constant

C. Decreases significantly

✓

D. Fluctuates rhythmically

📝 Explanation

Light activates phosphodiesterase, which aggressively breaks down cGMP. The drop in cGMP closes sodium channels, leading to the hyperpolarization of the rod cell.

📖 Additional Information

Increases drastically
Remains completely constant
Decreases significantly
Fluctuates rhythmically

Light activates phosphodiesterase, which aggressively breaks down cGMP. The drop in cGMP closes sodium channels, leading to the hyperpolarization of the rod cell.

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