Homeostasis is a one-word summary of the endocrine system; this system is responsible for the maintenance or regulation of the stable condition of the organism, or its equilibrium. Simply put, it is the balance of bodily functions, and the stable condition is the condition of optimal functioning for the organism.
The endocrine system is a control system of ductless endocrine glands. The endocrine system secretes chemical messengers called hormones, and the hormones circulate within the body via the bloodstream to affect distant organs.
The endocrine system provides an electrochemical connection from the hypothalamus of the brain to all the organs that control body metabolism, growth and development, and reproduction.
An endocrine gland is one of the internal organs involved in the secretion of hormones into the blood. The other major type of gland is the exocrine glands, such as salivary glands, sweat glands and glands within the gastrointestinal tract.