Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA. DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.
The heart is a vital organ located in the center of the chest with a slight tilt to the left. Using rhythmic muscle contractions, it circulates blood through veins and arteries, which supplies tissues with oxygenated blood and disposes waste.
Where are the heart and blood vessels found? The heart is a fist-sized organ which lies within the chest behind the breastbone (sternum). The heart sits on the main muscle of breathing (the diaphragm), which is found beneath the lungs.