They are kept clean by the little hairs inside your lungs that brush away all the dirt from your lungs, if you would like more answers to any questions that you may have that you need answering wether they are from how to cook a zebra to what how many geometictoric tonnes are in the earth?
To make your lungs clean, one should avoid smoking especially the passive smoking,
avoid allergens ,dust, chemicals and pollution.
Don't smoke, don't live in a city, keep away from dangerous chemical fumes, avoid industrial dusts and for that matter dust in general. and most of all have sex all the time
Don't smoke, do't be around heavy or even "mild" smokers.
By breathing clean air and exercising by deep breaths
Amazingly, mucus keeps your lungs clean but when you smoke more mucus is need to clean out the smoke in the lungs that's why smoker let out so much mucus.
Our lungs are surrounded by bones and it keeps the lungs in place.
Milk does not clean out your lungs. The consistency of milk can make mucous thicker making it harder to clear your lungs.
Not Smoking.
keeps them working stupid why else lungs power brain, brain controls lungs and others
Cillia are small hairs that have the function of "sweeping" tubes in our bodies. The cillia in our lungs sweep dust and other impurities towards our throat. Usually at night and in our sleep we cough or clear our throat and swallow this mucous. Yuk, but keeps our lungs clean.
The lungs do not clean dirty blood, although they do allow excess carbon dioxide to escape into the air. Dirty blood is filtered by the kidneys, not the lungs.
epiglottis
The lungs do not clean dirty blood, although they do allow excess carbon dioxide to escape into the air. Dirty blood is filtered by the kidneys, not the lungs.
The epiglottis
Cartilage keeps bronchi open
Water
help u breathe The respiratory system includes the heart and lungs. The lungs take in oxygen which pumps blood through the whole human body and to the heart. This process keeps the heart pumping which keeps you alive.