Discus why Lungs are so Vascularized

InstructionWhy do you suppose the lungs are so vascularized? C. Respiratory System Pathway Air passes into the , where dust and bacteria are filtered out by the and The air is then drawn down the which is kept open by rings of At the top of the trachea is a flap of epithelium tissue called the which closes when you to prevent food and liquids from going into the lungs. Each subdivides again into a mass of fine branches known as These end in tiny air sacs with bulb-like pockets called and in which gases are exchanged. The walls of the air sacs are MAX A/C A/C their outer surfaces are covered by a dense network of Blood flows into the air sacs through the The gas is released, which diffuses in the opposite direction of the gass


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