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cell

The cell is a minimum unit of an organization capable of acting autonomously. All living organisms are made by cells, and it is generally accepted that no body is a living if it has at least one cell . Some microscopic organisms, such as bacteria and protozoa, are cells only, while animals and plants consist of many millions of cells organized tissues and organs. Although virus and cell-free extracts perform many of the functions own cell living life without independent , growth and reproductive capacity typical of cells and therefore are not considered living organisms. The biology studies the cells according to their molecular constitution and how they cooperate with each other to form complex organisms like humans. To be able understand how the human body healthy, how it develops and ages and what fails in case of illness, is essential to know the cells that constitute it.