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There are two hormones, insulin and glucagon, that are responsible for controlling the blood glucose concentrations in the body. Controlling the blood glucose concentrations is an example of a negative feedback loop. After eating, the bodies blood glucose levels are high. In order to control these levels beta cells of the pancreas release the hormone Insulin, which causes a decrease in blood glucose concentration. Additionally, in the liver it stimulates glycogen synthesis, which promotes glucose uptake by the liver and adipose tissue. This then increases the rate of glucose breakdown by increasing cell respiration rates. After exercising, the bodies blood glucose levels are low. In order to control these levels alpha cells of the pancreas release glucagon, which can an increase in blood glucose concentrations. Additionally, in the liver it stimulates glycogen breakdown, which promotes glucose release by the liver and adipose tissue. This then decreases the rate of glucose break down by reducing respiration rates.

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