The circulatory system is a network consisting of blood, blood vessels, and the heart.
the circulatory system of the blood is seen as having two components, a systemic circulation and a pulmonary circulation.
the circulatory system, also called the cardiovascular system or the vascular system, is an organ system that permits blood to circulate and transport nutrients
(such as amino acids and electrolytes), oxygen, carbon dioxide, hormones,
Circulatory system, system that transports nutrients, respiratory gases, and metabolic products throughout a living organism, permitting integration among the various tissues.