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Respiratory System. The oxygen exchange in the lungs takes place across the membranes of small balloon-like structures called alveoli attached to the branches of the bronchial passages.These alveoli inflate and deflate with inhalation and exhalation. The behavior of the alveoli is largely dictated by LaPlace's law and surface tension.It takes some effort to breathe in because these tiny balloons must be inflated, but the elastic recoil of the tiny balloons assists us in the process of exhalation.his fluid, called a surfactant, lowers the surface tension of the balloon-like alveoli by about a factor of 15 compared to the normal mucous tissue fluid in which they are immersed.
What are Alveoli. Alveoli are the small balloon-like sacks of 200-500Î¼m diameter [1], making up a vital part of the respiratory zone of the human lungs. Each alveolus (singular) plays an important role in letting oxygen and carbon dioxide move into and from the bloodstream during inhalation and exhalation [2, 3]. Where are the alveoli found. The alveoli are all interconnected with each other, forming the final part of the bronchial tree. Originating from the alveolar duct located at the end of each bronchiole [4], there may be multiple alveoli arising from a single duct, often existing in clusters [2]. How Many Alveoli are Found in Each Lung