Which of the following glands is part of the endocrine system?

The pancreas is an essential part of the endocrine system because it plays a critical role in regulating blood sugar levels through the secretion of hormones such as insulin and glucagon. These hormones are released directly into the bloodstream, which is a key characteristic of endocrine glands. The pancreas also has an exocrine function, as it produces digestive enzymes that are released into the small intestine, but its contributions to metabolic regulation through hormonal secretion firmly categorize it as an endocrine gland. Understanding the roles of different glands helps clarify how the endocrine system maintains homeostasis in the body.