What is the most anterior portion of the uvea? Select one: a. Choroid b. Sclera c. Ciliary body d. Ora serrata e. Iris

The correct answer is e. Iris.<br /><br />The uvea is a layer of tissue in the eye that consists of three main parts: the iris, the ciliary body, and the choroid. The iris is the most anterior portion of the uvea, located in front of the lens and behind the cornea. It is responsible for controlling the size of the pupil and, therefore, the amount of light that enters the eye. The ciliary body is located behind the iris and is responsible for producing aqueous humor and controlling the shape of the lens. The choroid is the posterior portion of the uvea, located behind the retina, and provides blood supply to the eye. The sclera is the white, opaque outer layer of the eye that provides protection and shape, while the ora serrata is the boundary between the retina and the ciliary body.