Most hormones are released into circulation through ducts, but some are released directly into the blood stream.
Endocrinology is the study of hormones. An endocrine organ is an organ that produces hormones (the heart is one of these).
Hormones are carried in the blood
liver
a curtain
stomach
liver
pancreas
The endocrine system produces developmental hormones. :)
heart
I was looking for the answer to this too.
lungs
The endocrine system is involved in the production and release of hormones.