HORMONES, BERGERSEN PHARMACOLOGY IN NURSING.

HORMONES, Page 549,

The Twentieth, the first time medicine recognized, isolated, purification and chemical understanding of hormones. Now they are duplicated by chemical synthesis, some hormones not all.
A broad definition is ----- Any chemical substance released by one tissue, circulated by blood, and having characteristic effects on other tissues.
Products of the secretions of the anterior and posterior pituitary, and the Thyroid hormone, insulin and glucogen from the pancreas, Epinephrine and norepinephrine from the Adrenal Medulla, several potent steroids from the adrenal cortex, and the gonadal hormones of both sexes."

The above is a broad definition of Hormones.
Bergersen Pharmacology In Nursing Thirteeth Edition.