Oxygen is transported to the lungs via the respiratory tract. During inhalation (inspiration), air passes into our body through the mouth and the nose, continuing along the pharynx to your trachea (windpipe).

The trachea divides into airways called bronchi, which continue to branch throughout the lungs. The airways are predominantly covered with moist and hairy mucous membranes. This prevents harmful dust and bacteria from getting into the lungs.

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