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The Nephron: Distal Convoluted Tubule & Connecting Tubule:

The distal convoluted tubule begins at the end of the macula densa. It has short epithelial cells with highly invaginated basal membranes. It empties into the connecting tubule which in turn drains to the cortical collecting duct. The cells of the connecting tubule resemble those of the distal convoluted tubule but are taller and appear under light microscopy to be more textured. Both the distal convoluted tubule and the connecting tubule contain a few apical microvilli on each cell, but no distinct brush border as in the proximal tubule. With regard to permeability and transport these segments are similar in most respects to the thick ascending limb of Henle’s loop.

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