how are the lungs designed in human beings to maximize the area for exchange of gases?
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Lungs play a major role in the respiratory system. In humans, a pair of lungs are designed in such a way that they are lined by a thin membrane, the smaller tubes called bronchioles a balloon-like structure called alveoli and a network of blood capillaries increase the surface area for the exchange of gases. They are soft spongy and elastic organ enclosed in a thin membranous sac called the pleura.
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