Which ion's concentration is notably lower in aqueous humor compared to blood plasma?

The concentration of proteins in aqueous humor is significantly lower compared to that in blood plasma. Aqueous humor is a clear fluid found in the anterior chamber of the eye and plays a crucial role in maintaining intraocular pressure, providing nutrients to avascular structures such as the cornea and lens, and removing metabolic waste.

The reduced concentration of proteins in aqueous humor is essential for its function. High protein levels could lead to increased viscosity and turbidity, affecting light transmission and overall clarity, which is vital for proper vision. Moreover, excess proteins could potentially provoke an inflammatory response within the eye, leading to complications such as glaucoma or cataract formation.

In contrast, other ions such as bicarbonate, sodium, and calcium can have varying concentrations in aqueous humor compared to blood plasma, but proteins are notably more diluted. Understanding the composition of aqueous humor and its differences from blood plasma is important for recognizing various ocular pathologies and how they may affect intraocular fluid dynamics.