The circulatory system in humans is a closed cardiovascular system. It is composed of the heart, blood and blood vessels and uses those components to transfer nutrients and oxygen to and from different parts of the human body. The circulatory system doesn't just push blood through the human body in one big circle, the system is complex and moves blood throughout out your lungs, heart tissues, and all other tissues in your body, regulating pH in your body , and fighting foreign substances .
There are three main parts to the circulatory system. The main part is the heart, this is where the force behind the movement of the blood comes from. This part of the circulatory system is also known as the pulmonary system. The heart is a complex machine which is divided into four chambers, they are called the right atrium, the right ventricle, the left atrium, and the left ventricle. Myocardium makes up the walls of the heart which contracts continually causing the blood to be pumped in and out of the chambers and through the body. When the heart contracts it is pumping deoxygenated blood toward the lungs and pumping out oxygenated blood to the body.
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