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In contrast, systemic anatomy is the study of the structures that make up a discrete body system—that is, a group of structures that work together to perform a unique body function.
These technical advances enabled Matthias Jakob Schleiden and Theodor Schwann to recognize in 1838–39 that the cell is the fundamental unit of organization in all living things.
In order to better distinguish the detail in these sections, synthetic dyes were used to stain tissues with different colours.
For example, we might assume giraffes have more vertebrae in its neck than humans.
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