Abstract
Cell is the basic functional unit in the body. There are about 200 different (specialized) types of cells in human body, although each is genetically the same. Yet, they are different in size, shape and function due to the fact that not all the genes and not the same set of genes are functional or being used in each particular cell type (gene selectivity). Despite this diversity of cell composition and function, most cells in the body have the same structural organization. There are between 50 and 200 trillion of cells in the body of an average person (estimated) and they are constantly being dividing, metabolizing, working, dying and being replaced by integrated mechanisms. Therefore, structure, morphology, and function are tightly coupled in the cell giving to each specific cellular entity unique and distinguishable features.
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