Title: Respiratory tract
Content: from the base of the trachea. The alveoli are tiny air sacs in the lungs where gas exchange takes place. The mean number of alveoli in a human lung is 480 million. When the diaphragm contracts, a negative pressure is generated in the thorax and air rushes in to fill the cavity. When that happens, these sacs fill with air, making the lung expand. The alveoli are rich with capillaries, called alveolor capillaries. Here the red blood cells absorb oxygen from the air and then carry it back in the form of oxyhaemaglobin, to nourish the cells. The red blood

Title: Pulmonary alveolus
Content: the alveoli where, through diffusion, carbon dioxide is released and oxygen absorbed. The alveoli are located in the respiratory zone of the lungs, at the ends of the alveolar ducts and alveolar sac, representing the smallest units in the respiratory tract. They provide total surface area of about 75m. A typical pair of human lungs contain about 480 million alveoli, producing 70m of surface area. Each alveolus is wrapped in a fine mesh of capillaries covering about 70% of its area. An adult alveolus has an average diameter of 200 µm, with an increase in diameter during inhalation. The alveoli

Title: Pulmonary alveolus
Content: Pulmonary alveolus A pulmonary alveolus (plural: alveoli, from Latin "alveolus", "little cavity") is a hollow cavity found in the lung parenchyma, and is the basic unit of ventilation. Lung alveoli are the ends of the respiratory tree, branching from either alveolar sacs or alveolar ducts, which like alveoli are both sites of gas exchange with the blood as well. Alveoli are particular to mammalian lungs. Different structures are involved in gas exchange in other vertebrates. The alveolar membrane is the gas exchange surface. Carbon dioxide rich blood is pumped from the rest of the body into the capillaries that surround

Title: Pulmonary alveolus
Content: there are other causes of lung collapse such as trauma (pneumothorax), COPD, and pleuritis. Pulmonary alveolus A pulmonary alveolus (plural: alveoli, from Latin "alveolus", "little cavity") is a hollow cavity found in the lung parenchyma, and is the basic unit of ventilation. Lung alveoli are the ends of the respiratory tree, branching from either alveolar sacs or alveolar ducts, which like alveoli are both sites of gas exchange with the blood as well. Alveoli are particular to mammalian lungs. Different structures are involved in gas exchange in other vertebrates. The alveolar membrane is the gas exchange surface. Carbon dioxide rich

Title: Breathing
Content: are outside the lungs. The rest of the "tree" branches within the lungs, and ultimately extends to every part of the lungs. The alveoli are the blind-ended terminals of the "tree", meaning that any air that enters them has to exit via the same route it used to enter the alveoli. A system such as this creates dead space, a volume of air that fills the airways (the dead space) at the end of inhalation, and is breathed out, unchanged, during the next exhalation, never having reached the alveoli. Similarly, the dead space is filled with alveolar air at the

Question: Where in the human body do you find the alveoli?
Answer: Lung