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After hormonal stimulation, fluid reabsorption (JV) in locust hindgut from the KCl-rich, low-Na primary urine is driven primarily by an unusual mucosal electrogenic Cl- pump (JCl). 2. Cyclic-AMP increases JCl and also mucosal K+ and basolateral Cl- conductances, so that KCl absorption exceeds that of Na+ in rectum but not ileum. 3. Mucosal entry of Na+ occurs by exchange for NH4+ (H+), by cotransport with some neutral amino acids, and through putative channels. 4. However, transport of proline, the predominant organic substrate, is largely Na-independent and drives a sizable component of Jv in rectal but not ileal segments. 5. There is evidence for hormonal control of Na+ reabsorption in ileum but not rectum.

激素刺激后，蝗虫后肠从富含氯化钾、低钠的原尿中进行的液体重吸收（JV）主要由一种不寻常的黏膜电生性氯离子泵（JCl）驱动。2. 环磷酸腺苷增加JCl以及黏膜钾离子和基底外侧氯离子的电导，使得直肠中氯化钾的吸收超过钠离子，但回肠中并非如此。3. 钠离子通过与铵离子（氢离子）交换、与一些中性氨基酸共转运以及通过假定的通道进入黏膜。4. 然而，脯氨酸（主要的有机底物）的转运在很大程度上不依赖钠离子，并且在直肠段而非回肠段驱动了相当一部分的JV。5. 有证据表明回肠中存在对钠离子重吸收的激素控制，而直肠中则没有。

After hormonal stimulation, fluid reabsorption (JV) in locust hindgut from the KCl-rich, low-Na primary urine is driven primarily by an unusual mucosal electrogenic Cl- pump (JCl). 2. Cyclic-AMP increases JCl and also mucosal K+ and basolateral Cl- conductances, so that KCl absorption exceeds that of Na+ in rectum but not ileum. 3. Mucosal entry of Na+ occurs by exchange for NH4+ (H+), by cotransport with some neutral amino acids, and through putative channels. 4. However, transport of proline, the predominant organic substrate, is largely Na-independent and drives a sizable component of Jv in rectal but not ileal segments. 5. There is evidence for hormonal control of Na+ reabsorption in ileum but not rectum.

激素刺激后，蝗虫后肠从富含氯化钾、低钠的原尿中进行的液体重吸收（JV）主要由一种不寻常的黏膜电生性氯离子泵（JCl）驱动。2. 环磷酸腺苷增加JCl以及黏膜钾离子和基底外侧氯离子的电导，使得直肠中氯化钾的吸收超过钠离子，但回肠中并非如此。3. 钠离子通过与铵离子（氢离子）交换、与一些中性氨基酸共转运以及通过假定的通道进入黏膜。4. 然而，脯氨酸（主要的有机底物）的转运在很大程度上不依赖钠离子，并且在直肠段而非回肠段驱动了相当一部分的JV。5. 有证据表明回肠中存在对钠离子重吸收的激素控制，而直肠中则没有。

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