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.
Heart: The muscle that pumps blood received from veins into arteries throughout the body. ... See the entire definition of Heart. Heart attack: The death of heart muscle due to the loss of blood supply. The loss of bloo... See the entire definition of Heart attack. Heart disease: Any disorder that affects the heart. Sometimes the term heart disease is ... See the entire definition of Heart disease. Heart muscle: A type of muscle with unique features only found in the heart. The heart mus... See the entire definition of Heart muscle