The vitreous is approximately what percent water?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

The vitreous is approximately what percent water?

Explanation:
The vitreous humor is almost entirely water, about 99% by weight. The remaining roughly 1% is a solid gel network made mainly of collagen fibers (primarily type II) and hyaluronic acid, which gives the vitreous its structure and viscoelastic properties while preserving transparency. Because there is this tiny solid component, the cytoplasm isn’t 100% water, so a value like 99% fits best. Lower percentages would underestimate how much of the vitreous is water, and a claim of 100% would ignore the essential gel matrix present.

The vitreous humor is almost entirely water, about 99% by weight. The remaining roughly 1% is a solid gel network made mainly of collagen fibers (primarily type II) and hyaluronic acid, which gives the vitreous its structure and viscoelastic properties while preserving transparency. Because there is this tiny solid component, the cytoplasm isn’t 100% water, so a value like 99% fits best. Lower percentages would underestimate how much of the vitreous is water, and a claim of 100% would ignore the essential gel matrix present.

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