thin-walled. living cells capable of dividing and essential in photosynthesis. radial transport. energy storage. and production of protective compounds.

parenchyma cells (Wikipedia)

Parenchyma (/pəˈrɛŋkɪmə/) is the bulk of functional substance in an animal organ or structure such as a tumour. In zoology it is the name for the tissue that fills the interior of flatworms.

Lung parenchyma showing damage due to large subpleural bullae.
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