Abstract
Summary
1. Fresh human umbilical cords 20 cm in length were perfused with heparinized Group O blood while immersed in a solution the composition of which was similar to amniotic fluid. 2. Tritiated water was added to the perfusion fluid (blood) or the surrounding bath and the change in specific tritium activity determined as a function of time. 3. Rate of exchange of water between the 2 compartments was calculated to be 40.5 and 50.5 ml of water per hour. 4. Evidence is presented that the umbilical vessels and Wharton's jelly play a significant role in the water exchange of the amniotic fluid.
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