regulation of systemic arterial blood pressure by hormone hormonal control of blood pressure blood pressure regulation by hormone GO:0001990 The process in which hormones modulate the force with which blood passes through the circulatory system. A hormone is one of a group of substances formed in very small amounts in one specialized organ or group of cells and carried (sometimes in the bloodstream) to another organ or group of cells, in the same organism, upon which they have a specific regulatory action. biological_process hormonal regulation of blood pressure regulation of systemic arterial blood pressure mediated by a chemical signal endocrine process