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Respiratory bronchioles

Tubular airways that begin the respiratory zone


Connects the laryngopharynx with the trachea


Tube-like structure that conducts air from the larynx to the bronchi


Closes over the glottis during swallowing

Tracheal cartilages

Keep the trachea from collapsing

Tertiary bronchioles

Division of the bronchi that enter bronchopulmonary segments

Terminal bronchioles

Last division of the conducting zone


Conducts air from the nasopharynx to the larynogopharnx


Small, round sacs where gas exchange occurs


Small conduction airway that serves a lobule


Elevates the sternum

Internal intercostals

Depresses ribs

Abdominal muscles

Compresses abdominal contents and increases abdominal pressure


Elevates first and second ribs

External intercostals

Elevates ribs


Main inspiratory muscle


Flattern when contrated

Pectoralis minors

Elevate 3rd, 4th, and 5th ribs

Tidal Volume

The amount of the air inhaled and exhale during one normal breath

Inspiratory reserve volume

Maximum amount of air that can be inhaled after a normal inhalation

Expiratory reserve volume

Maximum amount of air that can be exhaled after a normal exhalation

Residual volume

Amount of air that remains in the lungs after a maximum exhalatio

Vital capacity

Maximum volume of air expelled after a maximal inhalation

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