In light adaptation:
A) Phototransduction does not occur in the retinal regions outside of the fovea.
B) Rhodopsin levels decrease in rods.
C) The iris' circular muscle relaxes.
D) Phototransduction does not occur in the retinal regions outside of the fovea, and rhodopsin levels decrease in rods.
E) Rhodopsin levels decrease in rods, and the iris' circular muscle relaxes.

Question

Quizplus · Accepted Answer

In light adaptation, the eyes adjust to brighter light conditions, and this results in a decrease in rhodopsin levels in the rods. However, phototransduction still occurs in the retinal regions outside of the fovea. The circular muscle of the iris contracts, causing the pupil to constrict, which is opposite to the stated answer. Therefore, the best choice is B, which correctly states that rhodopsin levels decrease in rods during light adaptation.

In Light Adaptation