the cardiovascular system and its functions

• Epicardium


  outer layer covering surface of heart
• Myocardium


  Middle layer consisting of cardiac muscle itself
• Endocardium


  Innermost layer that lines the chambers of the heart and covers its valves
• Pericardium


  Tough, sac-like membrane that encloses the heart
• Atria


  upper two chambers of the heart
• Ventricles


  lower two chambers of the heart
• Septum


  muscle that separated the 4 chambers
• Aorta: 


  the main artery of the body, supplying oxygenated blood to the circulatory system.
• pulmonary artery


  transports co2 and waste to lungs
• capillaries


  thin-walled vessels all over the body that branch from arterioles