Postrenal modification of urine in birds.
Postrenal modification of urine in birds.
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鸟类尿液的肾后修饰。
DOI：
10.1152/ajpregu.1985.248.1.r93
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
Braun,EJ
中科院分区：
文献类型：
--
作者：
Anderson,GL;Braun,EJ
本文研究了泄殖腔和下肠在清醒的正常水分的沙漠鹌鹑肾后尿液改变中的作用。对这些鸟进行了为期12天的研究，在此期间它们处于摄入量-产出量平衡状态。据计算，在进入下肠道的尿便混合物中，47%的水、62%的钠和49%的钾被重新吸收。如果这种物质被认为来自输尿管尿液，那么进入下肠道的输尿管尿液的成分改变如下：77%的水、72%的钠和82%的钾被重新吸收。对于尿酸盐，输尿管尿中总存在的68%在下肠中被降解。就肾脏产生的过滤负荷而言，下肠道重新吸收1.5%的过滤水、0.4%的过滤钠和46%的过滤钾。肾和肠道共同作用下的总过滤负荷为99.5%的水、99.8%的钠和88%的钾。鸟类的泄殖腔和下肠可能与哺乳动物的远端肾单位具有相似的功能，使水和钠从尿液中重新吸收。
The role of the cloaca and lower intestine in the postrenal modification of urine was studied in conscious normally hydrated desert quail. The birds were studied for a period of 12 days during which they were in intake-output balance. It was calculated that of the combined mixture of urine-feces entering the lower intestine, 47% water, 62% sodium, and 49% potassium were reabsorbed. If this material is considered as coming from the ureteral urine, then the composition of the ureteral urine entering the lower intestine was changed as follows: 77% water, 72% sodium, and 82% potassium were reabsorbed. For urate, 68% of the total present in ureteral urine was degraded in the lower intestine. In terms of the filtered load produced by the kidneys, the lower intestine reabsorbed 1.5% filtered water, 0.4% filtered sodium, and 46% filtered potassium. The total filtered loads reabsorbed by the combined efforts of the kidney and lower intestine were 99.5% water, 99.8% sodium, and 88% potassium. It appears that the cloaca and lower intestine of birds may serve a similar function to that of the distal nephron in mammals, making the fine adjustments in water and sodium reabsorption from the urine.