These are ductless glands (no tube to carry to various parts).
Their secretions are directly released into the blood which carries them to various parts of the body.
Exocrine glands
The exocrine glands have ducts.
The secretions from these glands are carried through the ducts.
The ducts may open outside the body to release the secretions (e.g.sweat, milk) or may be released on to another surface within the body (e.g. Digestive juices)
Hormones
These are chemical messengers that regulate physiological processes in living organisms.
They act upon specific cells/tissues/organs which are called target cells/tissues/organs.
There are many types of hormones that act on different aspects of bodily functions and processes like growth and development.
