The cardiovascular system (CVS) at its most basic consists of the heart and blood vessels
The primary concern of this system is to:
Deliver oxygenated blood and nutrients to the tissues of the body; most notably the central nervous system (CNS), renal system and the myocardium itself
Removemetabolic by-products, notably CO2 which is excreted by the lungs
Hence the CVS functions in close association with the pulmonary system