Replacement of columnar epithelium in respiratory tract to squamous epithelium is -
Metaplasia
o Metaplasia is a reversible change in which one differenated cell type is replaced by another differenated cell type.
o Metaplasia represents an adapve substuon of cells that are sensive to stress by cell types beer able to withstand the adverse environment,
o Metaplasia may be of two types
Hyperplasia
Hypoplasia
None of the above
Metaplasia