28. Explain why an individual with a blood glucose concentration (100 mg/100 mL of blood) will not have glucose in the urine, whereas an individual with a plasma glucose concentration of 375 mg/100 mL of blood will have glucose in the urine. Normal GFR (glomerular filtration rate, see pp. 755-756 in textbook) is approximately 180 L/day, and the kidneys' maximal transport rate for glucose is approximately 375 mg/min.

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