The greater the amount of active transport carried out by a cell, the greater the amount of mitochondria would be found in the cell. 
Active transport uses energy. Mitochondria undergoes aerobic respiration to release large amounts of energy. If the cell is found to be lacking in energy needed for active transport, the cell would adapt by synthesizing more mitochondrion to ensure that it's demand of energy is met.
        
             
        
        
        
According to sources, the most probable answer to this query is that nephrons found in the kidney are responsible for filtering out waste in the blood cells. The resulting product is urea. 
This is then excreted to the body.
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Answer:
About Eight million, seven hundred thousand!
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