Your heart is the only circulatory system organ. Capillaries have thin walls that allow oxygen, carbon dioxide, nutrients and waste products to pass into and out of cells. Capillaries: These blood vessels connect very small arteries (arterioles) and veins (venules).Veins in the legs have valves to keep blood from flowing backward. The inferior vena cava brings blood up from the lower body (stomach, pelvis and legs) to the heart. The superior vena cava carries blood from the upper body (head and arms) to the heart. Two central veins deliver blood to your heart. Veins start small (venules) and get larger as they approach your heart. Veins: These blood vessels return oxygen-depleted blood to the heart.The coronary arteries branch off the aorta, which then branch into smaller arteries (arterioles) as they get farther from your heart. It starts at the heart and travels up the chest (ascending aorta) and then down into the stomach (descending aorta). Arteries: Arteries are thin, muscular tubes that carry oxygenated blood away from the heart and to every part of your body.There are three main types of blood vessels: The coronary circuit then returns oxygen-poor blood to the heart’s right upper chamber (atrium) to send to the lungs for oxygen. This circuit provides the heart muscle with oxygenated blood. The coronary circuit: Coronary refers to your heart’s arteries.In the veins, the blood picks up waste products as the body uses up the oxygen, nutrients and hormones. The systemic circuit: In this circuit, blood with oxygen, nutrients and hormones travels from the heart to the rest of the body.The pulmonary veins return oxygenated blood to the heart. The pulmonary circuit: This circuit carries blood without oxygen from the heart to the lungs.Blood circulates through your heart and through these circuits in a continuous pattern: Your circulatory system has three circuits. What are the circulatory system circuits? Blood, made up of red and white blood cells, plasma and platelets.Blood vessels, which include your arteries, veins and capillaries.Heart, a muscular organ that pumps blood throughout your body.The parts of your circulatory system are your: Your lungs get rid of the carbon dioxide when you exhale.The veins carry deoxygenated blood and carbon dioxide back to the heart, which sends the blood to the lungs.As it moves through your body and organs, blood collects and drops off nutrients, hormones and waste products.This muscular part of the heart pumps blood out to the body through the arteries. The left atrium sends the oxygenated blood into the left ventricle (lower chamber).Pulmonary veins carry the oxygenated blood from the lungs to the heart’s left atrium (upper heart chamber). ![]()
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