The circulatory system, which includes the heart and blood vessels, is an important system that delivers oxygen and nutrients to the body and removes waste products. Key Takeaways The circulatory system includes the heart and blood vessels, where the heart pumps blood. The left ventricle sends oxygen-rich blood into systemic circulation through the arteries. Pulmonary circulation exchanges carbon dioxide for oxygen in the lungs. Arteries carry blood away from the heart, while veins carry deoxygenated blood back. Tiny blood vessels and red blood cells ensure a steady blood flow to organs. Conditions like high blood pressure can affect blood supply and circulation.
