Which of the following does not occur in a photoreceptor during exposure to light? A) membrane hyperpolarization. B) closure of Na+ channels in the outer segment. C) increased transmitter release from the synaptic terminal. D) absorption of light by photopigments E) closure of Ca²⁺ channels in the synaptic terminal.

Question

Quizplus · Accepted Answer

Exposure to light leads to a decrease in transmitter release from the photoreceptor synaptic terminal, not an increase. This is due to the membrane hyperpolarization caused by closure of Na+ channels in the outer segment and closure of Ca2+ channels in the synaptic terminal. Absorption of light by photopigments triggers this series of events.

Which of the Following Does Not Occur in a Photoreceptor