Answer:
It's important to treat hyperglycemia, because if left untreated, hyperglycemia can become severe and lead to serious complications requiring emergency care, such as a diabetic coma. In the long term, persistent hyperglycemia, even if not severe, can lead to complications affecting your eyes, kidneys, nerves and heart.
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When a cell is "at rest" it is in a state called the resting potential. In this state, neurons are more negatively charged ions inside the cell than outside the cell.