Final answer:
The respiratory defense against bacteria and foreign particles involves the mucociliary escalator, goblet cells that produce mucus, and alveolar macrophages that phagocytize pathogens. These mechanisms work together to prevent harmful substances from causing infection or damage in the lungs. The correct response is option F: A, C, and D are correct.
Step-by-step explanation:
The cells and structures that defend against bacteria and foreign particles entering the lungs include a combination of physical and immune defenses. The mucociliary escalator is a primary physical defense involving ciliated cells and mucus produced by goblet cells. These ciliated cells beat in such a way that the mucus which traps the particles is propelled towards the throat, where it can be swallowed and eliminated. Moreover, the immune defense is provided by alveolar macrophages, which roam the alveolar walls and phagocytize foreign particles and pathogens that have reached the alveoli.
The final answer encompasses goblet cells which produce mucus, the cilia that constitute the mucociliary escalator, and alveolar macrophages for phagocytosis in the lungs. This makes the correct choices A, C, and D, meaning that the answer is option F: A, C, and D are correct.
A two-line explanation: The respiratory system is protected by the mucociliary escalator and immune cells, including goblet cells secreting mucus, a ciliary system for particle removal, and alveolar macrophages for phagocytosis. Option F is the correct choice, encapsulating the full spectrum of lung defenses against inhaled particles and pathogens.