The beginning of the blood's journey through the body happens when the heart relaxes between beats and the blood flows from the atria to the ventricles from where the blood is pushed into the large arteries and then on... More »

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The circulatory system is important because it is transports blood and other materials throughout the body. Without the circulatory system, the body does not receive oxygen, and the heart and lungs fail to work. More »

In a shark's circulatory system, the heart pumps blood first to the gills where it is oxygenated, then to the organs and muscles, and finally back to the heart. To remain oxygenated, the blood must flow continually, and ... More »

The heart draws oxygenated blood from the lungs and distributes it to the rest of the body using a system of arteries and veins. Small coronary arteries and the pulmonary veins provide oxygenated blood into the heart. Th... More »

The basic circulatory system of vertebrate animals, which are those with a backbone, consists of a heart, the blood and the arteries and system of blood vessels. The heart pumps the blood first to the arteries and then t... More »

The main function of the circulatory system is transporting blood, oxygen, hormones, nutrients and other important substances throughout the body. The circulatory system is actually two separate systems of circulation, p... More »

The blood circulatory system transports nutrients and oxygen throughout the body. The system is comprised of the heart and blood vessels. More »