Cells
The cell is the basic structural, functional and biological unit of all known living organisms. Cells are the smallest unit of life that is classified as a living thing, and are often called the "building blocks of life".
The cell was discovered by Robert Hooke in 1665. 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. Cells emerged on Earth at least 3.5 billion years ago.
The word cell comes from the Latin cella, meaning "small room". It was coined by Robert Hooke in his book Micrographia (1665), in which he compared the cork cells he saw through his microscope to the small rooms monks lived in.
Inner life of a cell
Visit cells alive to watch more about cells.
Learn all about cells, its structure and its functions at
Structure and Functions
Plant Cell
Animal Cell
Cell Specialization
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Classification
Click on the image to view a summary of Lesson 1.
Click on the image to view a summary of Lesson 2.
Click on the image to view a summary of Lesson 3.
Click on the image to view a summary of Lesson 4.
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