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Tiny, thin-walled sacs in the lungs where gas exchange occurs between air and blood

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major air passageways branching from the trachea into the lungs

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Smaller air passageways branching from the bronchi, leading to the alveoli

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cells convert glucose and oxygen into energy, releasing carbon dioxide as a waste product allowing gas exchange

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cells lining the respiratory tract that move mucus and trapped particles upward and out of the lungs.

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cartilage that covers the larynx during swallowing to prevent food or liquids from entering the airways.

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breathing out carbon dioxide from the lungs.

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exchange of gases (oxygen and carbon dioxide) between the alveoli air and the pulmonary capillaries' blood.

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process of breathing in drawing air into the lungs.

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exchange of oxygen and carbon dioxide between the blood in capillaries and the body's tissues.

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"voice box," containing the vocal cords at the top of the trachea

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the primary organ of respiration where gas exchange occurs

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Spaces within the nose that warm, humidify, and filter inhaled air.

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divides the nasal cavity into right and left sides.

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the entry point for air into the respiratory system

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"throat," a passageway for air and food, connecting the nasal cavities and mouth to the larynx and esophagus.

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double-layered membrane surrounding the lungs that lubricates and reduces friction during breathing.

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the main process of gas exchange, using external and internal respiration

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organs and tissues responsible for breathing and gas exchange

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Air-filled cavities within the bones of the skull are connected to the nasal cavities to humidify and warm inhaled air.

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"windpipe," a tube connecting the larynx to the bronchi

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mechanical process of moving air into and out of the lungs (breathing)