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Yes, microplastics can come from degrading plastics, no matter what their shape or form.
Micro plastics in the bloodstream would be most likely to come from ingestion; that is either by eating or drinking contaminated products as it then becomes easier to enter the bloodstream.
Other microplastics would enter the body by inhalation when we breathe.
In general, most of the microplastics, in the body, are the PET type (polyethylene terephthalate) which comes from drink bottles, food containers and food wrapping.
So we need to be more careful and stringent. If not, then we run the risk of truly becoming a plastic society.
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Anthony T. Hincks