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.
An organ is a formation of the body that carries out a definite function. Organs could consist of the heart, the lungs, the eye and the ear. Depending on what way you want to view it, we can talk about the smallest internal organ or the smallest external organ. However, here we will focus on the smallest internal organ.