What is the function of the adrenal glands?

The adrenal glands play a crucial role in the body's endocrine system by regulating metabolic and hormonal activities. These small, triangular-shaped glands located on top of each kidney produce a variety of hormones that are essential for several bodily functions. For instance, they secrete cortisol, which helps regulate metabolism, the immune response, and blood pressure. Additionally, they release adrenaline (epinephrine), which is involved in the body's fight-or-flight response, impacting heart rate, blood flow, and energy mobilization. Through the release of these hormones and others, the adrenal glands help maintain homeostasis and respond to stressors, showcasing their fundamental role in regulating both metabolic and hormonal activities.

The other options, while pertaining to important bodily functions, do not accurately describe the primary function of the adrenal glands. Digestion regulation is mainly managed by the gastrointestinal tract and associated organs. Blood filtration is a function primarily associated with the kidneys, which remove waste products from the bloodstream. Structural support in the body is provided by various tissues, such as connective tissue and bones, rather than the adrenal glands. Thus, the correct choice focuses on the essential regulatory roles played by the adrenal glands in metabolic and hormonal processes.