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The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
Lung and Heart. The left lung is a little smaller than the right lung, since your heart is a little left of center of your chest. The heart, found in between the left and the right lung, occupies some of the space where your left lung is found.