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The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper

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The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper respiratory tract: the nose, pharynx, and larynx. (b) The organs of the lower respiratory tract, which includes the trachea, right and left primary bronchi, bronchial tree, and lungs.
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