The circulatory system is the system of the human body that is responsible for delivering oxygen, nutrients, and disease-fighting cells to the body’s organs and tissues. Parts of the circulatory system include the cardiovascular system, which consists of the heart, lungs, blood vessels, and blood, as well as the lymphatic system, made up of the lymph vessels, nodes, and lymph itself. The cardiovascular system brings oxygen and glucose to the body’s tissues in the blood and distributes white blood cells, which defend against disease. The lymphatic system produces and transports additional immune cells. The cardiovascular system is known as a closed system, meaning that the blood it carries is re-circulated, while the lymphatic system is open, meaning that the lymph, the clear fluid within, is able to exit its complex of vessels and enter the cardiovascular system.
Within the cardiovascular system are several important parts of the circulatory system. They include two major organs, the heart and lungs. Also part of this system is a network of arteries, which carry oxygenated blood away from the heart, and veins, which bring deoxygenated blood back to the heart to receive more oxygen in the lungs. Blood is also part of the cardiovascular system.
Blood is the fluid that transports the disease-fighting white blood cells, the oxygen-supplying red blood cells, and the fuel-replenishing electrolytes to the body’s various tissues. There are two systems for circulating blood. During pulmonary circulation, the deoxygenated blood that has been returned to the heart is pumped into the lungs, where it receives more oxygen, and then pumped back into the heart to be distributed throughout the body. Systemic circulation is the process by which the arteries take this blood away from the heart and deliver it to the body, only for the blood to be returned by the veins to receive a new supply of oxygen.
The lymph itself is the name for fluid traveling