Final answer:
When blood glucose levels are high, the pancreas releases insulin, which helps lower blood sugar levels by increasing glucose uptake in cells and storing it as glycogen in the liver.
Step-by-step explanation:
When blood glucose levels are high, the correct response is C.) The pancreas releases insulin. Insulin is a hormone produced by beta cells in the pancreas that regulates blood sugar levels by facilitating the uptake of glucose into cells and the conversion of excess glucose into glycogen for storage, primarily in the liver. This process helps lower the elevated blood glucose levels to normal. Conversely, when blood glucose levels are low, alpha cells in the pancreas release the hormone glucagon, which triggers the liver to convert stored glycogen back into glucose, thereby increasing blood glucose levels.