What is the function of an endocrine gland?

The function of an endocrine gland is to produce secretions that are released into the bloodstream. Endocrine glands, such as the pituitary gland, thyroid gland, and adrenal glands, secrete hormones directly into the circulatory system. These hormones travel through the bloodstream to target organs or tissues, where they exert their effects. This mode of hormone release allows for widespread and systemic regulation of various physiological processes, including metabolism, growth, reproduction, and response to stress.

In contrast, the other options pertain to different types of glands or functions. Ducts are associated with exocrine glands, which release their products through ducts to specific sites, not directly into the bloodstream. Storing minerals and nutrients is more characteristic of certain tissues or organs, rather than the primary function of endocrine glands. Generating nerve impulses is a function associated with the nervous system, primarily carried out by neurons, not endocrine glands. Therefore, the unique role of endocrine glands as providers of internal chemical signals to the body via the bloodstream underscores why this option is correct.