What causes cGMP to convert to GMP and close Na⁺ channels in a photoreceptor?

Name: What causes cGMP to convert to GMP and close Na + channels in a photoreceptor?
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Question

Quizplus · Accepted Answer

When a photon of light is absorbed by a photoreceptor, the opsin activates and catalyzes the conversion of cGMP to GMP. This causes the Na⁺ channels to close, which stops the influx of sodium ions and hyperpolarizes the photoreceptor, leading to the cessation of neurotransmitter release.

What Causes CGMP to Convert to GMP and Close Na+

What Causes CGMP to Convert to GMP and Close Na⁺