The endocrine system is made up of the endocrine
glands that secrete hormones. Although there are eight
major endocrine glands scattered throughout the body,
they are still considered to be one system because
they have similar functions, similar mechanisms of
influence, and many important interrelationships.
Some glands also have non-endocrine regions that
have functions other than hormone secretion. For example,
the pancreas has a major exocrine portion that secretes
digestive enzymes and an endocrine portion that secretes
hormones. The ovaries and testes secrete hormones
and also produce the ova and sperm. Some organs, such
as the stomach,