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).Blood cells pick up oxygen in the lungs.Blood travels through the pulmonary trunk (the main pulmonary artery). The heart’s bottom right pumping chamber (right ventricle) sends blood that’s low in oxygen (oxygen-poor blood) to the lungs.These blood vessels work with your heart and lungs to continuously circulate blood through your body. Your circulatory system functions with the help of blood vessels that include arteries, veins and capillaries. Other chemical byproducts from your organs.Carbon dioxide from respiration (breathing).The circulatory system also helps your body get rid of waste products. This blood circulation keeps organs, muscles and tissues healthy and working to keep you alive. The circulatory system’s function is to move blood throughout the body.

Heart sketch