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          Kidneys
          Beginning of essay 
In vertebrates,  are the two major organs of excretion.  Excess
water, toxic waste products of metabolism such as urea, uric acid, and inorganic
salts are disposed of by  in the form of urine.   are also largely
responsible for maintaining the water balance of the body and the pH of the
blood.  Kid ....
          Middle of essay ....ts, glucose, amino acids, and
nitrogenous wastes such as urea and a small amount of ammonia through the
glomerus.  Proteins and fats are filtered out of the plasma, to remain in the
normal blood stream.  The plasma is now called glorular filtrate.  One-hundred
to one-hundred-forty milliliters of this filtrate are formed each minute!
	The filtrate passes along a convoluted tibule.  The majority of the
water content and some of the dissolved materials are reabsorbed through the
walls of the tibul....           |   
          
          
          | Number of words: 558 | 
          Approximate pages: 3 | 
           
           
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