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The choroid of the eye is sandwiched between the sclera (the white of the eye) and retina (the thin, light-sensitive inner layer at the rear of the eye). This membrane is packed with blood vessels that carry oxygen and other nourishment to the adjacent outer portion of the retina.
Phospholipids are found in all cell membranes. Cholesterol Cholesterol is a steroid and they are built from 4 fused hydrocarbon rings. The hydrocarbon tail is connected to the steroid at one end, and a hydroxyl group is connected to the other end.Cholesterol is a steroid important in cell membranes and acts as a precursor to some sex hormones.holesterol Cholesterol is a steroid and they are built from 4 fused hydrocarbon rings. The hydrocarbon tail is connected to the steroid at one end, and a hydroxyl group is connected to the other end. Cholesterol is a steroid important in cell membranes and acts as a precursor to some sex hormones.