This is the Urinary System Process; Urine and Tubule you need to know

System Urine

The filtration apparatus of the renal glomeruli consists of an expanded basement membrane and slit pore associated with podocytes. Epithelial cells of the proximal tubule are specialized for absorption and ion transport. They remove most of the sodium and water from urine, as well as virtually all of the amino acids, proteins, and glucose. 

The brush border of the proximal tubule cells contains proteases. The cells of the distal tubule, under the influence of aldosterone, resorb sodium and acidify the urine.
The brush border of the proximal tubule cells contains proteases. The cells of the distal tubule, under the influence of aldosterone, resorb sodium and acidify the urine.
Specialized cells of the distal tubule (the macula densa) monitor ion levels in the urine and stimulate the juxtaglomerular (JG) cells of the afferent arteriole to secrete renin, an enzyme that cleaves angiotensinogen to a precursor of angiotensin II. Collecting ducts contain light and dark (intercalated) cells; they are sensitive to antidiuretic hormone (ADH) and are the final mechanism for concentrating urine. Transitional epithelium (allowing for stretch) is found lining the calyces, renal pelvis, ureters, and urinary bladder.

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