Questions: Question 4 ( 0.5 points) The thin, light-sensitive membrane that lies at the back of the eye and contains the photoreceptor cells is the: 1) fovea. 2) optic disk. 3) retina. 4) optic nerve.

The answer is the third one (3): retina.

Explanation for each option:

1. Fovea: The fovea is a small depression in the retina where visual acuity is highest. It is not the entire light-sensitive membrane but a specific part of the retina.
2. Optic disk: The optic disk is the point on the retina where the optic nerve fibers exit the eye. It is also known as the blind spot because it lacks photoreceptor cells.
3. Retina: The retina is the thin, light-sensitive membrane at the back of the eye that contains photoreceptor cells (rods and cones). These cells are responsible for converting light into neural signals.
4. Optic nerve: The optic nerve is the bundle of nerve fibers that transmits visual information from the retina to the brain. It is not a light-sensitive membrane.

Summary: The thin, light-sensitive membrane that lies at the back of the eye and contains the photoreceptor cells is the retina.