DNA replication is the process by which DNA makes a copy of itself during cell division. 1  The first step in DNA replication is to âunzipâ the double helix structure of the DNA molecule.
The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes. The heart is located in the middle compartment of the mediastinum in the chest.
The heart is the muscular organ situated in between the lungs, behind the sternum and slightly tilted towards the left side of the breastbone. Rhythmic muscular contractions activate the heart to pump blood through a system of arteries and veins called the cardiovascular system. Keep Learning.