Schröder H, Leichtweiss H P
Am J Physiol. 1977 Jun;232(6):H666-70. doi: 10.1152/ajpheart.1977.232.6.H666.
The transfer of tritiated water across the isolated, artificially perfused guinea pig placenta was the subject of 21 experiments. The observed relationship between the flow rates and the relative transfer of water cannot be explained by a concurrent or pool-flow system. If the direction of the fetal flow is reversed, the rate of transfer is lowered. It may be concluded, that the decrease is a result of a change from a nonideal countercurrent flow system to a nonideal concurrent system. This conclusion, however, holds only if all other parameters that determine the exchange as well remain unaffected. In the range of flows investigated, the transfer of water is flow limited.
21项实验研究了氚标记水在离体、人工灌注的豚鼠胎盘间的转运。水流速率与水的相对转运之间的关系，无法用并流或池流系统来解释。如果胎儿血流方向逆转，转运速率会降低。可以得出结论，这种降低是由于从非理想逆流系统转变为非理想并流系统所致。然而，只有在所有其他决定交换的参数也保持不变的情况下，这一结论才成立。在所研究的血流范围内，水的转运受血流限制。
