Exposure to micro‐ and nano‐plastics: From human internal burden to systems‐level health‐risk interpretation

Micro- and nano-plastics (MNPs) can enter the human body through inhalation, ingestion, contact with consumer products, and iatrogenic routes. The clinical relevance of MNP exposure should be interpreted at three levels: barrier interaction, cellular stress, and system-level disruption, with key mechanisms including oxidative stress, mitochondrial dysfunction, and chronic inflammation.