The formation of definitive alveoli by secondary septation of primitive saccules is effectively an essentially postnatal event: if the alveolar phase of human lung development extends from about ...

PULMONARY alveolar microlithiasis is a rare and extraordinary disease in which microscopic stones are found within the pulmonary alveoli. The lungs, which are heavy and stony hard, cut with the ...

model contains many of the critical features of alveolar macrophages found in the lungs, including onion-shaped phagolysosomes (left) and the cell nucleus (right). A human cell culture model of ...