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lung
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Diagram of the lung.
Diagram of the lung. Medial view of the right lung.

lung

anatomy
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William Stokes

lung, in air-breathing vertebrates, either of the two large organs of respiration located in the chest cavity and responsible for adding oxygen to and removing carbon dioxide from the blood. In humans each lung is encased in a thin membranous sac called the pleura, and each is connected with the trachea (windpipe) by its main bronchus (large air passageway) and with the heart by the pulmonary arteries. The lungs are soft, light, spongy, elastic organs that normally, after birth, always contain some air. If healthy, they will float in water and crackle when squeezed; diseased lungs sink. In the inner ...(100 of 537 words)

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