the Circulatory system
circulatory System or Cardiovascular System.
vein
Artery (Aorta is the main vessel that allows blood travel from the heart to all parts of the body, except the lungs).
Veins - return deoxygenated blood to the heart to be reoxygenated. In contrast to arteries that bring the oxgenated blood from the heart, to the rest of the body for use.
veins from the body or the pulmonary veins from the lungs