Question

question 7
______ help keep the lungs clean.
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Explanation:

In the respiratory system, cilia (tiny hair - like structures) or macrophages (a type of white blood cell) or mucus can help keep the lungs clean. Cilia line the airways and move in a coordinated way to sweep out debris and pathogens. Macrophages can engulf and digest foreign particles. Mucus traps particles, and then cilia move the mucus (with trapped particles) out. A common and specific answer related to the structures that help keep lungs clean is "Cilia" (or "Macrophages", "Mucus" can also be acceptable, but cilia is a very typical structure for this function in the respiratory tract).

Answer:

Cilia (or Macrophages, or Mucus)