Subunit of an organ (or tissue) performing a certain function for the organ. e.g., nephrons in kidney, alveoli in lung. Functional sub-units are a concept used to model the radiation response of normal tissues.
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Previous glossary entries
from ICRP Publication 103, 2007 and ICRP Publication 118, 2012
Functional subunits of tissues, e.g., nephrons in kidney, alveoli in lung.