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.
Heart and circulation. Photo: H.Baensch. BÃ¤nsch like in all, vertebrates theâshark s central circulatory organ is the, heart which pumps the blood to the, gills tissues and back to the. Heart fish, hearts including the hearts of, sharks are structured differently from those of other, vertebrates. however