ACIH secretes both acetylcholine hormone to vascular tunic - choroid and pigmented cells of iris are part of the eyeball body consists of the lens. All are correct. Sclera is located in the posterior part of the eyeball. Macula lutea, vitreous body, the optic disk, and macula alba are all correct. The transparent portion of the conjunctiva eye is the cornea. The pigmented portion of the conjunctiva eye is the iris. The canal of Schlemm is the correct answer. The central opening in the conjunctiva through which light passes is the pupil. The anterior chamber of the eye is the correct answer. The external auditory canal produces ear wax. None of the above is the correct answer. The part of the retina having both optic disk, rod, and cone cells is the macula lutea.