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The cell is the structural and functional unit of all known living organisms, and is sometimes called the building block of life. Some organisms, such as bacteria, are unicellular (consist of a single cell). Other organisms, such as humans, are multicellular. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm; a typical cell mass is 1 nanogram.) The largest known cell is an ostrich egg.

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Channels: Scientific Animations Cell Biology

Tags: cell celllife AmasingAnimation

Upload by: second on 30-07-2007.

Duration: 3m 10s

Dnatube: Sciencific and Medical video site.