Question

anatomy and physiology of the respiratory system terminal bronchioles respiratory bronchioles alveolar duct ~ final destination alveoli ~ 500,000,000 in lungs (!) alveolar macrophage pneumocytes type i type ii secretes surfactant regenerate & replace damaged cells decreases surface tension keeps alveoli open multiple - choice question which of the following correctly summarizes the function of alveolar macrophages? their rigid structure keeps the bronchus open. it defends the body by engulfing particles or pathogens that enter the alveolus. they replace damaged cells. they contain cilia that brush debris toward to pharynx.

Explanation:

Alveolar macrophages are immune - cells in the alveoli. Their main function is phagocytosis, which means they engulf particles and pathogens that enter the alveolus to protect the body.

Answer:

It defends the body by engulfing particles or pathogens that enter the alveolus.