Table 6.

Typical dimension of lung’s microstructures [16, 17], which were considered as final sites of ⁵⁶Mn dioxide microparticles penetration into the lungs

Component	Thickness of epithelium
Alveolar duct	Mostly simple squamous epithelium cells (thickness from 0.05 μm to 0.3 μm)
Alveoli	Each alveoli is lined with simple squamous epithelium cells (from 0.05 μm to 0.3 μm thick) and covered over cells by surfactant (about 0.01 μm thick)