u15a07 Urine Formation
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The glomerulus is a unique high-pressure capillary bed because the _1_ arteriole feeding it is larger in diameter than the _2_ arteriole draining the bed. Glomerular filtrate is very similar to _3_, but it has fewer proteins. Mechanisms of tubular reabsorption include _4_ and _5_ transport. As an aid for the reabsorption process, the cells of the proximal convoluted tubule have dense _6_ on their apical surface, which increase the surface area dramatically. Other than reabsorption, an important tubule function is _7_, which is important for ridding the body of substances not already in the filtrate like drugs and toxins. In a day's time, 180 liters of blood plasma are filtered into the kidney tubules, but only about _8_ liters of urine are actually produced. _9_ is responsible for the normal yellow color of urine. The four major nitrogenous wastes found in the blood, which must be disposed of, are ammonia, uric acid, urea, and _10_.
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10. *
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