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Herophilus made many important discoveries and was followed by his younger contemporary Erasistratus, who is sometimes regarded as the founder of physiology.
Collectively, these are known as organ systems.
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.
This is the result of humans having ancestors that began walking on their hind limbs rather than using all four limbs.
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