The process of internal secretion where glands or organs produce hormones directly into the blood; also, the substances (hormones) so produced

a substance produced and released from a cell, gland, or organ

Process by which glands or organs discharge secretions through a duct to the outside of the body or into a body cavity; external secretion.

an organ that releases hormones directly into the blood, such as the thyroid or pituitary gland

secretory gland; endocrine gland

(biology) A small membrane-bound storage container within a cell that holds substances to be released outside the cell

endocrine disorder; any medical condition or disease affecting the endocrine system

Gland or organ in the body that produces secretions and sends them through a duct directly to where they are needed

The system of ductless glands that secrete hormones directly into the circulatory system to regulate body functions

the branch of medicine and biology concerned with the endocrine system