significant changes in respiratory bronchioles following exposure included : a thicker wall and a narrower lumen , a thicker epithelial compartment and a much thicker interstitial compartment , shifts in epithelial cell populations with many more nonciliated bronchiolar epithelial cells and fewer squamous type i epithelial cells , larger nonciliated bronchiolar epithelial cells with a larger complement of cellular organelles associated with protein synthesis , greater amounts of both interstitial fibers and amorphous ground substance , greater numbers of interstitial smooth muscle cells per epithelial basal lamina surface area , and greater volumes of interstitial smooth muscle , macrophages , mast cells , and neutrophils per epithelial basal lamina surface area .
C1135918
smooth muscle cells
C1267092
smooth muscle