A hormone is a product of an endocrine gland that is released into the blood. Hormones regulate development and activity in target tissues somewhere else at a distance in the body. Steroid hormones include cortisol, estrogen, and testosterone. Non-steroid hormones include choleckystokinin, epinephrine, dopamine, insulin, norepinephrine, serotonin, and vasopressin.
Steroid hormones, like estrogen, directly affect gene expression in their target cells. …
