The circulatory, or cardiovascular system, is composed of
Athe lungs, heart and brain.
Bthe lungs, blood vessels and heart.
Cthe heart, blood and blood vessels.
Dthe heart, arteries and veins.
Athe lungs, heart and brain.
Bthe lungs, blood vessels and heart.
Cthe heart, blood and blood vessels.
Dthe heart, arteries and veins.