Macrophages in these structures protect against agents such as Mycobacterium tuberculosis.
A class of cells in these structures have an attenuated cytoplasm between 50 to 100 microns wide, generally lack organelles, and are very thin and long with a flattened nucleus. Unlike in other adult mammals, the holes between these things in humans tend to increase with age and are known as the Pores of Kohn. The A and D types of a substance produced in these structures opsonize pathogens. At 24 weeks of gestation, cells in these structures start secreting a substance that doesn't appear in adequate quantity until 35 weeks, creating a risk for (*) IRDS. The primary component of one substance produced by these structures is abbreviated DPPC. Macrophages in these structures protect against agents such as Mycobacterium tuberculosis. Type II cells of the walls of these structures secrete pulmonary surfactant. For 10 points, name these numerous small cavities in the lungs where gas exchange happens.
A class of cells in these structures have an attenuated cytoplasm between 50 to 100 microns wide, generally lack organelles, and are very thin and long with a flattened nucleus.
pulmonary alveoli [or pulmonary alveolus; prompt on lungs before "Pores"]