Solution-Why are excess glucose molecules in the blood

Proteins are involved in which of the three kidney functions? (I have tried researching this one and I don't know the terms or they are not exactly clear on what they're saying.)
In some samples, glucose is found in the urine. What might cause this condition?
Why are excess glucose molecules in the blood excreted?
The concentration of sodium in the blood is greater than in the urine, yet most of the sodium ions in the urine move back into the blood. What process makes this movement happen?
Urea is a by-product of amino-acid metabolism. Next to water, urea is the most abundant material found in urine. If urea were allowed to accumulate in the blood, what might happen?
Homeostasis is the maintenance of a relatively stable internal environment in an organism, so how does the kidney functions as a homeostatic organ?

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Why are excess glucose molecules in the blood excreted : Proteins are involved in which of the three kidney functions? In some samples, glucose is found in the urine. What might cause this condition?

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