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.
blood circulation. The movement of blood through the left atrium and ventricle of the heart, aorta, arteries, arterioles, capillaries, venules, veins, vena cava, and back to the right side of the heart, into the pulmonary artery, lungs, and left side of the heart again.ystemic circulation the general circulation, carrying oxygenated blood from the left ventricle to the body tissues, and returning venous blood to the right atrium. umbilical circulation fetal circulation through the umbilical vessels.