The circulation or streaming movement of protoplasm or cytoplasm within a cell, creating a continuous circular flow that distributes nutrients and organelles.
From 'cyclo-' (circle, circulation) + Greek '-osis' (process, condition). First observed in plant cells under early microscopes.
Cyclosis was one of the first signs that cells were alive and active—in the 1600s, scientists looking through primitive microscopes watched plant cells and saw the cytoplasm streaming in circles, proving cells weren't just static bags!
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