 systemic circulation is the part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart. this physiologic theory of circulation was first described by amato lusitano (joÃ£o rodrigues from castelo branco, 1511-1568), a portuguese doctor working in italy, in his work composed by seven volumes curationum medicinalium centuriÃ¦ septem 1st. edition in 1551. he was the first to describe venous valves.amatus lusitanus discovered valves in veins and arteries; by david hashavit, citation: "there's a reasonable basis to assume that it was dr. amatus who first discovered the "blood circulation" phenomena" in 1628, william harvey published his description of blood circulation in de motu cordis.harvey, w., exercitatio anatomica de motu cordis et sanguinis in animalibus, frankfurt, w. fitzeri, 1628 this term is opposed and contrasted to the term pulmonary circulation first proposed by ibn al-nafis. ==course==  systemic circulation refers to the part of the circulatory system in which the blood leaves the heart, services the body's cells, and then re-enters the heart. blood leaves through the left ventricle to the aorta, the body's largest artery. the aorta leads to smaller arteries, arterioles, and finally capillaries.{{cite web | url=http://lsa.colorado.edu/essence/texts/heart.html | title =the circulatory system part ii: the heart and circulation of blood | author = | author2 =university of colorado boulder | publisher =colorado.edu | date=february 3, 2014| au
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