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Basic Human Cell Structure Monday, November 30, 2009 - Anuradha Menon Home >> Picture Of The Day >> Biology   
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| The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing, and is often called the building block of life. Humans have an estimated 100 trillion cells; a typical cell size is 10 µm; a typical cell mass is 1 nanogram. | ||||||||||
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In 1835, before the final cell theory was developed, Jan Evangelista Purkyn observed small "granules" while looking at the plant tissue through a microscope. The cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that all cells come from preexisting cells, that vital functions of an organism occur within cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells. (Source: Wikipedia) |
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