Antonino S. Rocha
= Antonino S. Rocha
{c}
<Antonino S. Rocha> investigated transport in the <kidney>, including how the <thick ascending limb> of the <Loop of Henle> handles <sodium chloride> and <water>. A 1973 study with <Juha P. Kokko> tested isolated rabbit nephron segments under controlled perfusion conditions.<Sodium chloride and water transport in the medullary thick ascending limb of Henle. Evidence for active chloride transport by Antonino S. Rocha and Juha P. Kokko>[Byline and Abstract: isolated medullary thick ascending limbs]{ref}
Increasing the surrounding <osmolality> produced essentially no net fluid movement in the tested segments, whereas the outgoing tubular fluid became more dilute under suitable perfusion conditions. Measurements of sodium and chloride concentrations supported removal of <sodium chloride> from the lumen without an accompanying large <water> flux.<Sodium chloride and water transport in the medullary thick ascending limb of Henle. Evidence for active chloride transport by Antonino S. Rocha and Juha P. Kokko>[Abstract: imposed osmotic gradients, near-zero net fluid transport and reduced effluent ion concentrations]{ref}
The illuminating result is a separation of salt and water transport. Removing dissolved material while leaving most of the <water> behind can dilute tubular fluid and help build a concentrating environment around the tubule. The measured transport properties are distinct from identifying every molecular transporter responsible; the paper's historical chloride-pump interpretation should not be treated as a complete modern molecular account.