Photoreceptors respond to light energy. When activated, vertebrate photoreceptors cause Na⁺ channels to close, resulting in: A)an action potential. B)depolarization of the cell membrane. C)repolarization of the cell membrane. D)hyperpolarization of the cell membrane.

Question

Quizplus · Accepted Answer

When photoreceptors are activated, Na^{+ and} channels close, causing the cell membrane to become more negative and ultimately leading to hyperpolarization. This hyperpolarization is what generates the signal that is sent to the brain to process visual information. Therefore, the correct choice is D.

Photoreceptors Respond to Light Energy