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 | Cardiac Cycle | The Blood | Types of Arteries | Blood Circulation | Blood Pressure | ECG. Systemic Circulation The carotid artery is a major artery of the head and neck. There are two carotid arteries, one on the left and one on the right.