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| This level includes atoms, such as, carbon, hydrogen, oxygen, nitrogen, calcium, and molecules essential for maintaining life. |
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| 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. |
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| 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. |
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| 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. |
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| 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. |
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| All the systems of the body combine to make the organism, that is one human being. |
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