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Levels of organization
Levels of organization of body systems
6
Anatomy
Undergraduate 1
08/26/2007

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Term
Chemical Level
Definition
This level includes atoms, such as, carbon, hydrogen, oxygen, nitrogen, calcium, and molecules essential for maintaining life.
Term
Cellular Level
Definition
Molecules combine to form structures such as cells. Cells are the basic structural and functional units of an organism and the smallest living units in the human body.
Term
Tissue Level
Definition
Tissues are groups of cells and the matter surrounding them that work together to perform a particular function. The four basic types of tissue in your body are epithelial tissue, connective tissue, muscle tissue, and nervous tissue.
Term
Organ Level
Definition
At the organ level, different kinds of tissue join together to form body structures. Organs usually have a recognizable shape, are composed of two or more different types of tissues, and have specific functions.
Term
System Level
Definition
System level consists of related organs that have a common function. An example is the digestive system, which breaks down and absorbs molecules in food.
Term
Organism Level
Definition
All the systems of the body combine to make the organism, that is one human being.
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