Final answer:
Excess glucose can be excreted in urine if the blood glucose level exceeds the transport maximum. The reabsorption of glucose occurs in the kidney.
Step-by-step explanation:
Glucose can be excreted in urine if there are more glucose molecules present than the carrier proteins can handle. This is because there is a transport maximum, or Tm, for glucose. The Tm is the maximum amount of glucose that can be reabsorbed by the kidneys. If the blood glucose level exceeds the Tm, the excess glucose is not transported and is excreted in the urine. The reabsorption of glucose occurs in the kidney, where glucose is filtered and then reabsorbed in another part of the kidney.
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