Respiratory System Key Terms 3
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Dalton’s law states that each specific gas in a mixture exerts its own pressure as if it were alone in the mixture.
The dorsal respiratory group (DRG) is a medulla oblongata region that stimulates diaphragm and intercostal muscle contraction to induce inspiration.
The dorsum nasi is the intermediate external nose portion connecting the bridge to the apex, supported by the nasal bone.
The epiglottis is a leaf-shaped elastic cartilage in the larynx that closes the trachea during swallowing.
Expiration (exhalation) is the process that causes air to leave the lungs.
ERV is the amount of air forcefully exhaled after a normal tidal exhalation.
The external nose is the visible region of the nose.
External respiration is the gas exchange occurring in the alveoli.
Fauces is the posterior oral cavity portion connecting the oral cavity to the oropharynx.
The fibroelastic membrane connects the ends of the C-shaped tracheal cartilage and contains smooth muscle fibers.
Forced breathing (hyperpnea) is active breathing during exercise requiring muscle contraction for both inspiration and expiration.
Foregut is the embryonic endoderm region toward the head.
FRC is the sum of ERV and RV, the air remaining in lungs after tidal expiration.
The glottis is the opening between vocal folds through which air passes during speech.
The Haldane effect describes how oxygen partial pressure affects hemoglobin's affinity for carbon dioxide.
Henry’s law states gas concentration in a liquid is proportional to its solubility and partial pressure.
The hilum is the lung's concave mediastinal surface where vessels, nerves, and a bronchus enter.
Hyperpnea is increased ventilation rate and depth due to higher oxygen demand without major blood gas changes.
Hyperventilation is increased ventilation causing low blood CO2 and high (alkaline) blood pH.
Inspiration (inhalation) is the process causing air to enter the lungs.