1. Purposeful movement of the whole body or parts of
the body (such as walking or waving your hands)
2. Manipulation of external objects (e.g. driving a car
or moving a piece of furniture)
3. Propulsion of contents through various hollow
internal organs (e.g. circulation of blood or
movement of a meal through the digestive tract)
4. Emptying the contents of certain organs to the
external environment (e.g. urination or giving birth)
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