Hormones and the Endocrine System Hormones are the powerful chemical messengers of the endocrine system. Unlike the nervous system, which uses rapid electrical signals, the endocrine system uses hormones secreted by specialised glands (like the thyroid, pituitary, and adrenal glands) directly into the bloodstream. From the bloodstream, these hormones travel throughout the body until they reach their specific target cells or organs, bind to receptors and trigger a specific action. The endocrine system operates relatively slowly because it relies on blood circulation, but its effects are profound and long-lasting. It is often the case that what you did in the […]