Which of these occurs when light strikes photoreceptors?
A)The chromophore retinal undergoes a change of shape.
B)There is an increase in neurotransmitter release from photoreceptor cells.
C)The photoreceptor cell membrane becomes depolarized.
D)The concentration of cyclic GMP inside cells increases.
E)The photoreceptor cells are stimulated and fire action potentials.

Question

Which of these occurs when light strikes photoreceptors?
A)The chromophore retinal undergoes a change of shape.
B)There is an increase in neurotransmitter release from photoreceptor cells.
C)The photoreceptor cell membrane becomes depolarized.
D)The concentration of cyclic GMP inside cells increases.
E)The photoreceptor cells are stimulated and fire action potentials.

Quizplus · Accepted Answer

When light strikes photoreceptors, the chromophore retinal (which is part of the protein molecule known as rhodopsin in rod cells and photopsin in cone cells) undergoes a change of shape. This shapes change leads to phototransduction, which ultimately leads to the generation of a neural signal that our brain can interpret as vision.

Which of These Occurs When Light Strikes Photoreceptors