insofar as future developments are concerned , much remains to be understood concerning ( 1 ) the responses of all cell types to cytotoxic influences , including their respective abilities to repair induced damage , ( 2 ) cell-cell and cell-extracellular matrix relationships in response to injury , ( 3 ) the uniqueness of the basement membrane in the lung in controlling permeability and gaseous exchange , ( 4 ) the role ( s ) of alveolar macrophages in response to injury and their relationships to the septal macrophage population , ( 5 ) the aberrations in the respective cell types that can give rise to neoplastic growth , and ( 6 ) the role of the immune system in responding to the general defense of the lung .
C0024432
population
C0020962
immune system