Under low or reduced light conditions, which of the following is responsible for the inward-directed sodium current in the outer segments of the photoreceptors?
A)Metarhodopsin II
B)cGMP
C)cis-retinal
D)cAMP

Question

Quizplus · Accepted Answer

cGMP is responsible for the inward-directed sodium current in the outer segments of the photoreceptors under low or reduced light conditions. This occurs because cGMP binds to and opens sodium channels, allowing sodium ions to flow into the cell.

Under Low or Reduced Light Conditions, Which of the Following