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Levels of
Organization
- Cells
- Cells are the basic functional units of animal
life. The specialized cells in an animal's body collect together
into functional groups called tissues, organs and systems that
contribute to the health
and well-being of the animal.
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- Tissues
- Tissues are groups of specialized cells. The
entire animal body is made up of just 4 basic tissues
 | Epithelial tissue |
| Connective tissue |
| Muscle tissue |
| Nervous tissue |
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- Organs
- Organs are made up of groups of tissues that
work together for common purposes.
For example, the kidney is an organ made up of various tissues
that, together, function to eliminate wastes from the
body.
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Systems
- Systems are groups of organs that are involved
in a common set of activities.
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