Lung Lung Lung Lung - oxygen flow Lung Lung is the organ concerned with respiration. Between the lungs lie the heart, major blood vessels, and the esophagus.
Air enters the body through the nose and mouth and passes into the throat.
Inside the lungs, oxygen from freshly breathed air enters the bloodstream. At the same time, carbon dioxide leaves the blood and enters the lungs to be breathed out. The right lung, consisting of three lobes, is slightly larger than the left lung, which has only two lobes. Each lobe is further divided into segments. As the two main bronchi enter the lungs, they divide into narrower bronchi.