In anatomy and physiology, a duct is a circumscribed channel leading from an exocrine gland or organ.
Striated duct in parotid gland
A gland is a cell or an organ in an animal's body that produces and secretes different substances either into the bloodstream or into a body cavity or outer surface that the organism needs. A gland may also function to remove unwanted substances such as urine from the body.
Histopathology of sclerosing adenosis of the breast.