Glandular structures are specialized tissues in the body that produce and secrete substances such as hormones, enzymes, or other fluids. They can be classified into two main types: endocrine glands, which release their products directly into the bloodstream, and exocrine glands, which secrete substances through ducts to specific locations. Examples of endocrine glands include the thyroid and adrenal glands, while salivary glands and sweat glands are examples of exocrine glands. These structures play crucial roles in various bodily functions, including metabolism, growth, and digestion. The secretions from glandular structures help regulate processes like blood sugar levels and water balance. Proper functioning of these glands is essential for maintaining overall health and homeostasis in the body.