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Respiratory System Key Terms 3

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  • Dalton’s law

    Dalton’s law states that each specific gas in a mixture exerts its own pressure as if it were alone in the mixture.

  • Dorsal respiratory group (DRG)

    The dorsal respiratory group (DRG) is a medulla oblongata region that stimulates diaphragm and intercostal muscle contraction to induce inspiration.

  • Dorsum nasi

    The dorsum nasi is the intermediate external nose portion connecting the bridge to the apex, supported by the nasal bone.

  • Epiglottis

    The epiglottis is a leaf-shaped elastic cartilage in the larynx that closes the trachea during swallowing.

  • Expiration

    Expiration (exhalation) is the process that causes air to leave the lungs.

  • Expiratory reserve volume (ERV)

    ERV is the amount of air forcefully exhaled after a normal tidal exhalation.

  • External nose

    The external nose is the visible region of the nose.

  • External respiration

    External respiration is the gas exchange occurring in the alveoli.

  • Fauces

    Fauces is the posterior oral cavity portion connecting the oral cavity to the oropharynx.

  • Fibroelastic membrane

    The fibroelastic membrane connects the ends of the C-shaped tracheal cartilage and contains smooth muscle fibers.

  • Forced breathing

    Forced breathing (hyperpnea) is active breathing during exercise requiring muscle contraction for both inspiration and expiration.

  • Foregut

    Foregut is the embryonic endoderm region toward the head.

  • Functional residual capacity (FRC)

    FRC is the sum of ERV and RV, the air remaining in lungs after tidal expiration.

  • Glottis

    The glottis is the opening between vocal folds through which air passes during speech.

  • Haldane effect

    The Haldane effect describes how oxygen partial pressure affects hemoglobin's affinity for carbon dioxide.

  • Henry’s law

    Henry’s law states gas concentration in a liquid is proportional to its solubility and partial pressure.

  • Hilum

    The hilum is the lung's concave mediastinal surface where vessels, nerves, and a bronchus enter.

  • Hyperpnea

    Hyperpnea is increased ventilation rate and depth due to higher oxygen demand without major blood gas changes.

  • Hyperventilation

    Hyperventilation is increased ventilation causing low blood CO2 and high (alkaline) blood pH.

  • Inspiration

    Inspiration (inhalation) is the process causing air to enter the lungs.