Which of the following is NOT a type of endocrine gland?

Sudoriferous glands are not classified as endocrine glands; instead, they are categorized as exocrine glands. The primary function of sudoriferous glands, which are sweat glands, is to secrete sweat to the surface of the skin through ducts, helping to regulate body temperature and excrete waste.

On the other hand, adrenal, thyroid, and pituitary glands are all integral components of the endocrine system. These glands release hormones directly into the bloodstream, which then travel to target organs and tissues to regulate various physiological processes. For instance, the adrenal glands produce hormones involved in stress response, the thyroid gland is responsible for regulating metabolism, and the pituitary gland often referred to as the "master gland," controls other endocrine glands and various bodily functions through the hormones it secretes. Understanding the distinction between endocrine and exocrine glands is essential for grasping how different glands contribute to bodily functions.