How do particles travel through the human respiratory tract?

The human respiratory tract conducts air to the alveoli for gas exchange, filtering incoming air through structures like the nasal mucosa. Airborne particulate matter can penetrate this tract, reaching deep into the lungs and potentially entering the bloodstream. Exposure to these fine particles is linked to various severe health conditions, including respiratory and cardiovascular diseases.

What we know

• The respiratory tract conducts air to the alveoli to enable gas exchange in mammals. [2]
• The nasal mucosa acts as a filter that traps pollutants and harmful substances found in inhaled air. [2]
• Particulate matter can penetrate deep into the lungs and travel through the bloodstream to multiple organs, such as the brain. [3]
• Airborne particulate matter is classified as an IARC Group 1 carcinogen. [3]

Where to go next

• what followedWhat are the health effects of particulate matter?
• a case in pointHow do medical aerosols treat respiratory illnesses?
• the bigger pictureWhat is the anatomy of the human respiratory system?
• how it workedHow does the nasal cavity filter incoming air?
• what caused itWhat are the primary sources of atmospheric aerosols?
• an unexpected connectionHow do hydroelectric dams relate to atmospheric aerosols?Hydroelectric dams can generate anthropogenic aerosols through the mist discharged from their operations.

Sources

• [1]respiratory tract (Wikidata Q13400765) · CC0 1.0
• [2]Respiratory tract · CC BY-SA 4.0
• [3]Particulate matter · CC BY-SA 4.0
• [4]Aerosol · CC BY-SA 4.0
• [5]Acid rain · CC BY-SA 4.0