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Glucose is added to the blood:

  • Directly from the gums and inside of the mouth, when glucose and closely-related sugars are absorbed through mucous membranes into the bloodstream
  • Similarly through the small intestine when food with sugar in it is digested and passed into the blood
  • Stored glycogen in the liver is converted to glucose and released into the blood when various body signals request higher blood sugar

Glucose leaves the blood:

  • Normally by being absorbed into body cells with the aid of insulin, when insulin is present
  • Abnormally by being filtered and excreted by the kidneys when the amount in the blood exceeds the 'renal threshold' for glucose, when insulin is insufficient.

When glucose is added to the blood faster than it leaves, blood glucose gets high. Note that all these processes can happen in minutes or hours, so it is quite possible to go from low glucose to abnomally high, or with insulin injections even from high to dangerously low, within as little as 15 minutes.

This is why all diabetics benefit from testing their blood glucose frequently.

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What are the term used when the person having blood glucose level below and above the critical level?

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Is glucose a blood sugar?

Correct, glucose is a blood sugar.


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