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This is accomplished by the cardiovascular system using blood as the transporting fluid.
4.) Internal respiration: movement of oxygen from blood to the tissue cells and of carbon dioxide from tissue cells to blood.
Respiratory Zone: the actual site of gas exchange, is composed of the terminal bronchioles, respiratory bronchioles, alveolar ducts and alveoli sacs, alveoli, all microscopic structures.
Conducting Zone: includes all other respiratory passageways, which provide fairly rigid conduits for air to reach the gas exchange sites: secondary bronchi, tertiary bronchi, bronchioles.
The Nose and Paranasal Sinuses
The nose is the only externally visible part of the respiratory system...
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