Answer Happy

Which of the following statements regarding the alveolar macrophages are true: O They phagocytose infectious organisms such as tubercle bacilli. O They can pass through the alveolar septum and may then return into septal connective tissue. O These are all true statements. O They are filled with accumulated material, they remain in septal connective tissue. O They remove particles from the air alveolar space.
Before B cells secrete antibodies, they differentiate into stem cells O plasma cells O T cells O antigen presenting cells O macrophages