The hormone is carried to its target organ mainly by the circulatory system. Step 1: Hormones are released by endocrine glands directly into the bloodstream. Step 2: The bloodstream acts as a transport system, circulating the hormones throughout the body. Step 3: Hormones travel until they reach specific cells or organs that have receptors designed to bind with them. These are the target organs. Step 4: Binding to the receptors triggers a specific response in the target organ.