lung

Definition

noun
  • one of two organs of respiration in the body into which air is sucked when a person breathes
    (Note For other terms referring to the lungs, see words beginning with bronch-, broncho-, pneum-, pneumo-, pneumon-, pneumono-, pulmo-.)
COMMENT The two lungs are situated in the chest cavity, protected by the ribcage. The heart lies between the lungs. The right lung has three lobes, the left lung only two. Air goes down into the lungs through the trachea and bronchi. It passes to the alveoli where its oxygen is deposited in the blood in exchange for waste carbon dioxide which is exhaled (gas exchange). Lung cancer can be caused by smoking tobacco, and is commonest in people who are heavy smokers.
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