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Joints help in the flexibility of bones, but a bone cannot be bent or stretched until a muscle acts on it.
Movement of limbs happens due to the contraction and relaxation of corresponding muscles present in that region.
The many books Galen wrote became the unquestioned authority for anatomy and medicine in Europe because they were the only ancient Greek anatomical texts that survived the Dark Ages in the form of Arabic (and then Latin) translations.
Primitive early microscopes enabled Marcello Malpighi to discover the system of tiny capillaries connecting the arterial and venous networks, Robert Hooke to first observe the small compartments in plants that he called “cells,” and Antonie van Leeuwenhoek to observe muscle fibres and spermatozoa.
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