Which statement accurately describes the changes in the membrane potential of a photoreceptor cell when light rays strike its photopigments?

Question

Quizplus · Accepted Answer

When light rays strike the photopigments of a photoreceptor cell, it undergoes hyperpolarization, meaning the membrane potential becomes more negative. This occurs because the photopigments undergo a conformational change that activates a signaling cascade that results in the closure of cation channels, such as those allowing the entry of sodium ions. This reduces the current passing through the cell and, consequently, reduces its depolarization. The hyperpolarization of the photoreceptor cell is then translated into a graded potential that modulates the release of neurotransmitters, allowing light detection by the nervous system.

Which Statement Accurately Describes the Changes in the Membrane Potential