Cell theory
Cell Theory
Cell theory (pronounced: /sɛl θɪəri/) is a fundamental concept in biology that describes the properties and functions of cells, the basic unit of life. The theory was developed in the 19th century by Matthias Schleiden and Theodor Schwann.
Etymology
The term "cell" was first used by Robert Hooke in 1665 when he compared the cork cells he saw through his microscope to the small rooms monks lived in, called cells. The word "theory" comes from the Greek word "theoria", which means "a looking at, viewing, beholding".
Definition
Cell theory states that:
- All living organisms are composed of one or more cells.
- The cell is the basic unit of structure and organization in organisms.
- Cells arise from pre-existing cells.
Related Terms
- Cell: The basic structural and functional unit of all organisms.
- Biology: The scientific study of life and living organisms.
- Microscope: An instrument used to see objects that are too small for the naked eye.
- Organism: An individual animal, plant, or single-celled life form.
History
The cell theory was developed in the 19th century by German scientists Matthias Schleiden, a botanist, and Theodor Schwann, a physiologist. Schleiden proposed that all plant tissues are composed of cells, and Schwann extended this idea to animal tissues. Later, Rudolf Virchow added the third principle that all cells come from pre-existing cells.
Importance
Cell theory is one of the foundations of biology. It provides a framework for understanding the structure and function of organisms, the mechanisms of life processes, and the basis for the diversity of life.
See Also
External links
- Medical encyclopedia article on Cell theory
- Wikipedia's article - Cell theory
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