Functions of insulin
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Insulin helps control blood glucose levels by signaling the liver and muscle and fat cells to take in glucose from the blood. Insulin therefore helps cells to take in glucose to be used for energy. If the body has sufficient energy, insulin signals the liver to take up glucose and store it as glycogen.

Explanation:

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added