Robert Hooke coined the term cell, after viewing a thin cutting of a cork under a microscope, which looked like small chambers (latin cella). Cells are the building blocks of living organisms. Each cell in our body contain genetic material. This is the DNA and is stored in the nucleus. Each of cells contains the same DNA. Various cells have different structure and function, and this is because different cells express only certain parts of DNA and these are the genes. Cells can be exposed to stress and trauma and are able to adapt, achieving a new steady state. However, if the adaption is not reached, cells do not recover thus ending in death via necrosis or apoptosis.