Final answer:
The endocrine system, particularly the pancreas, releases insulin to regulate blood glucose levels by enhancing glucose uptake in cells and conversion to glycogen in the liver.
Step-by-step explanation:
The correct answer to which system helps control blood glucose levels is B. The endocrine system releases a hormone that balances blood glucose levels. In particular, the pancreas secretes insulin in response to elevated blood glucose levels. Insulin enhances the uptake of glucose by body cells and prompts the liver to convert glucose into glycogen for storage, thereby reducing blood glucose levels and maintaining homeostasis.
After a meal, when blood glucose levels rise, the beta cells of the pancreas release insulin. This hormone stimulates cells throughout the body to absorb glucose, which reduces the concentration of glucose in the blood. Simultaneously, insulin inhibits the liver from breaking down stored glycogen into glucose, effectively managing blood glucose levels within a normal range.
In summary, it is insulin and the endocrine system's role in its production and release that regulates blood glucose, not the immune, digestive, or reproductive systems.