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 is a powerful organ responsible for circulation of blood and delivery of oxygen and important nutrients throughout the body.It consists of four chambers: the right atrium, right ventricle, left atrium, and left ventricle.he heart is a powerful organ responsible for circulation of blood and delivery of oxygen and important nutrients throughout the body.