heart's arteries and veins are organs that work together to make up what
The heart, the lungs, and the veins and arteries (blood vessels) make up the circulatory system. Working together, they ensure that blood flows through the whole network that makes up the human body (systemic circulation), as well as within the lungs (pulmonary circulation) and the heart (coronary circulation).eins and arteries are known as blood vessels. Arteries carry blood away from the heart and veins carry blood toward the heart. The major blood vessels that branch out of the heart are the aorta, the vena cava, and the pulmonary arteries and pulmonary veins.