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.
Your heart pumps blood around the body via two different classifications of blood circulation-pulmonary circulation, carrying deoxygenated blood to lungs and systemic circulation, carrying oxygen-rich blood to all oxygen-needed cells.Each type of system plays a different role in the overall process of circulation.. The main difference between the two circulatory systems is the destination of the blood that's being circulated. Pulmonary circulation carries blood to and from the oxygen-exchange surfaces within a person's lungs.