What is the function of alveolar macrophages?

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What is the function of alveolar macrophages?

Alveolar macrophages are the lungs’ resident cleanup cells. They sit on the surface of the alveoli and continually inspect the air spaces for inhaled particles, debris, and bacteria that slip past other defenses. Their main job is phagocytosis: engulfing and digesting these foreign materials to keep the alveoli clean so gas exchange can occur efficiently. They also release signals to recruit other immune cells when needed. This function is distinct from other roles in the lung: oxygen transport is performed by red blood cells in the capillaries, mucus is produced by goblet cells in the conducting airways, and surfactant is produced by type II pneumocytes. So the best description is that they engulf particles that have eluded other defenses.

Alveolar macrophages are the lungs’ resident cleanup cells. They sit on the surface of the alveoli and continually inspect the air spaces for inhaled particles, debris, and bacteria that slip past other defenses. Their main job is phagocytosis: engulfing and digesting these foreign materials to keep the alveoli clean so gas exchange can occur efficiently. They also release signals to recruit other immune cells when needed. This function is distinct from other roles in the lung: oxygen transport is performed by red blood cells in the capillaries, mucus is produced by goblet cells in the conducting airways, and surfactant is produced by type II pneumocytes. So the best description is that they engulf particles that have eluded other defenses.

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