2.5 circulation circuit

• The pulmonary circuit transports blood to and from the lungs, where it picks up oxygen and drops off carbon dioxide
• The systemic circuit transports freshly oxygenated blood to virtually all of the tissues of the body and returns relatively deoxygenated blood and carbon dioxide to the heart to be sent back to the pulmonary circulation.
• Circulation Circuit

  A) Superior vena cava

  B) Inferior Vena Cava

  C) right lung

  D) right arteries

  E) right veins

  F) left lung

  G) left arteries

  H) left veins

  
• Blood that is carrying carbon dioxide and waste products from the body tissues is returned to the right atrium via the superior vena cava and the inferior vena cava.
• From the right atrium, the deoxygenated blood moves through the tricuspid valve into the right ventricle
• The right ventricle pumps deoxygenated blood through the pulmonary valve into the pulmonary trunk, which splits into the right and left pulmonary arteries, leading toward the lungs
• These arteries branch many times before reaching the pulmonary capillaries, where gas exchange occurs: carbon dioxide exits the blood, and oxygen enters.
• Freshly oxygenated blood returns from the lungs to the left atrium via the pulmonary veins.
• From the left atrium, the blood moves through the mitral valve into the left ventricle.
• The left ventricle pumps blood through the aortic valve, into the aorta, delivering blood to all parts of the body