Glucose is needed by cells for respiration. It is important that the concentration of glucose in the blood is maintained at a constant level and controlled carefully. Insulin is a hormone - produced by a gland called the pancreas - that regulates glucose concentrations in the blood.
If the blood glucose concentration is too high, the pancreas produces the hormone insulin, which causes glucose to move from the blood into the cells. Insulin targets liver and muscle cells, causing them to take up excess glucose and convert it to glycogen for storage. The glucose can then be used at a later date when the body needs it.
|Low glucose||High glucose|
|Effect on pancreas||Insulin not secreted into the blood||Insulin secreted into the blood|
|Effect on liver||Does not convert glucose into glycogen||Converts glucose into glycogen|