Biology 30 – Nervous And Endocrine System Practice Test

Middle layer of tissue in the eye that contains blood vessels that nourish the retina

Retina Choroid layer Sclera Iris

Correct Answer:

Choroid layer

Explanation:

The middle tissue layer that contains blood vessels nourishing the retina is the choroid. It sits between the white, tough outer layer (the sclera) and the light-sensitive inner layer (the retina). The choroid is rich in blood vessels, providing oxygen and nutrients to the retina, especially to the photoreceptors on the outer retina. It also helps absorb excess light to improve visual clarity. By contrast, the retina itself is the sensory tissue that detects light, the sclera protects the eye, and the iris controls the amount of light entering the eye.

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