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Fortunately, your understanding of how the human hand manipulates tools—from pens to cell phones—helps you appreciate the unique alignment of the thumb in opposition to the four fingers, making your hand a structure that allows you to pinch and grasp objects and type text messages.
Whereas anatomy is about structure, physiology is about function.
For example, when we bend our arm, muscles in that region contract, become shorter and stiffer and pull the bones to the direction of movement.
Thin sections and staining had become standard tools for microscopic anatomists by the late 19th century.
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