Which of these fluids is considered to be anatomically isolated?

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Vitreous fluid is the clear gel-like substance that fills the large chamber at the back of the eye called the vitreous chamber. It is anatomically isolated because it is contained within the eye and does not freely communicate with other body fluids. Oral fluid, bile, and urine are all secreted by organs that are connected to other body systems and have the potential to mix with other fluids or be influenced by them.

Which of These Fluids Is Considered to Be Anatomically Isolated