Understanding Insulin's Role in Blood Glucose Levels

The endocrine system plays a vital role in regulating various bodily functions through the secretion of hormones. One key hormone produced by the pancreas is insulin, which is essential for glucose metabolism.

Insulin helps cells in the body absorb glucose from the bloodstream, facilitating the use of glucose for energy. If insulin levels are insufficient or the body's cells do not respond effectively to insulin, this can lead to conditions such as diabetes mellitus. Understanding how insulin functions is crucial to grasping the overall workings of the endocrine system.

Which of the following statements about insulin is correct?