The human body houses many different endocrine glands. These glands play an integral role in regulating the body's hormones, to control a diverse range of functions such as metabolism, growth, sexual development and stress responses. Some synonymous terms for endocrine gland include hormone-secreting gland, ductless gland, or internal secretion gland. These glands secrete hormones directly into the bloodstream, instead of through a duct. Some of the primary endocrine glands include the pituitary gland, thyroid gland, adrenal gland, pancreas, and ovaries/testes. Each of these glands contributes to specific functions and processes, highlighting the crucial role that endocrine system maintains for well-being and optimal function of the human body.