Osmotic Pressure and Aqueous Humor Formation in Dogfish

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Science  01 Jul 1960:
Vol. 132, Issue 3418, pp. 36-37
DOI: 10.1126/science.132.3418.36


Comparative chemical analyses show the aqueous humor of smooth dogfish has lower concentrations of urea and trimethylamine oxide than the blood plasma. Freezing-point depression determinations demonstrate that the aqueous humor has a correspondingly lower osmotic pressure. It would appear that water entering the aqueous humor from the plasma is moving against an osmotic gradient.