As a respiratory specialist, I can explain the process of how the oxygen is filtered as it enters the human body.

The nose is the primary organ that filters the air we breathe. It is lined with tiny hairs called cilia and a mucus membrane that traps dust, bacteria, and other particles. This process helps to clean the air before it reaches the lungs.

Beyond the nose, the pharynx (throat) and the larynx (voice box) also play a role in filtering out larger particles. However, these structures do not filter out gases or very small particles.

The alveoli in the lungs are where the actual exchange of oxygen and carbon dioxide takes place, but they do not filter the air. It's the respiratory system's earlier components that provide the filtration.

So, to summarize, the nose is the main filter for the oxygen that enters the body, with some additional filtering occurring in the pharynx and larynx.

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The lungs and respiratory system allow oxygen in the air to be taken into the body, while also enabling the body to get rid of carbon dioxide in the air breathed out. ... Even if the air you breathe is dirty or polluted, your respiratory system filters out foreign matter and organisms that enter through the nose and mouth.read more >>