Which of the following is a function of the adrenal glands?

The adrenal glands play a crucial role in the body's endocrine system and have several important functions. One of their primary roles is the regulation of metabolism, which involves how the body uses nutrients and produces energy. This is essential for maintaining overall health and energy levels.

In addition to regulating metabolism, the adrenal glands release cortisol, a hormone that plays a vital role in stress response, immune function, and the regulation of glucose metabolism. Cortisol helps manage how the body uses fats, proteins, and carbohydrates, thus directly influencing metabolism.

Given that both the regulation of metabolism and the release of cortisol are key functions of the adrenal glands, the choice that encompasses both these functions is the correct answer. The other choices may reference aspects of adrenal gland function but do not cover the complete scope as effectively as the combined option.