Which of the following is NOT a normal function of insulin?

Insulin is a crucial hormone produced by the pancreas that plays a fundamental role in regulating blood glucose levels. One of its primary functions is to lower blood glucose levels by facilitating the uptake of glucose into cells, which helps to reduce the concentration of glucose in the bloodstream. When insulin is released, it signals the liver to take up excess glucose and store it as glycogen. In addition, it enables muscle and fat cells to absorb glucose, thus providing them with the energy needed for various cellular functions.

In contrast, increasing the level of glucose in the body is not a function of insulin; it is, rather, the role of hormones such as glucagon and epinephrine. These hormones act to raise blood sugar levels when they fall too low, ensuring that the body has adequate energy supply. Thus, the assertion that insulin increases the level of glucose in the body is incorrect and highlights a misunderstanding of insulin's role in glucose metabolism.