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Cells, Tissues, and Organs Study Guide (page 2)

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Updated on Sep 21, 2011

In Short

Cells are the basic unit of life. All living organisms are made of cells. Some cells, like those of bacteria, are very simple, yet they perform a wide range of functions. Other cells are more elaborately constructed, but may perform only one function because they are part of a larger organism, where many cells combine to perform the necessary functions of life. All cells are microscopic in size, and there are many types of cells. In larger, multicelled organisms, cells can specialize in their functions, which creates a division of labor. Some cells perform one thing while others do another. This kind of specialization leads to groups of cells equally specialized in a function. These grouped cells are known as tissues.

We each start out as a single fertilized cell, and we then grow and develop over several years to our adult stage. This growth and development is a process that separates life from nonlife. It also makes it necessary to group tissues together into larger units called organs, which perform more complicated functions than do the single tissues that make them up. Generally, in complex organisms like plants and animals, many organs are then grouped together into specific systems.

Practice problems of this concept can be found at: Cells Tissues and Organs Practice Questions

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