<unk> es are muscular blood vessels that carry blood away from the heart. All<unk> es, with the exception of the pulmonary and umbilical<unk> es, carry oxygenated blood.
The circulatory system is extremely important for sustaining life. Its proper functioning is responsible for the delivery of oxygen and nutrients to all cells, as well as the removal of carbon dioxide and waste products, maintenance of optimum pH, and the mobility of the elements, proteins and cells of the immune system. In developed countries, the two leading causes of death, myocardial infarction and stroke each may directly result from an<unk> al system that has been slowly and progressively compromised by years of deterioration. (See atherosclerosis).
Artery
Deep vein
Arteriole
Lymph vessel
Peripheral vein
Coronary arteries
Coronary circulation
Blood vessel