DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.
The heart pumps oxygenated blood to the body and deoxygenated blood to the lungs. In the human heart there is one atrium and one ventricle for each circulation, and with both a systemic and a pulmonary circulation there are four chambers in total: left atrium, left ventricle, right atrium and right ventricle.
The heart has four chambers through which blood flows: two sets of each type of chamber (atria and ventricles), one per side, each with distinct functions. The left side of the heart deals with systemic circulation while the right side of the heart deals with pulmonary circulation. The Atria. The atria are chambers in which blood enters the heart. They are located on the anterior end of the heart, with one atrium on each side.