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During examination of an axial section through the thorax, a…

During examination of an axial section through the thorax, a student identifies the potential spaces between the visceral and parietal pleura surrounding each lung. Which directional relationship correctly describes the location of these pleural cavities relative to the mediastinum?

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The phrenic nerve originates from which of the following loc…

The phrenic nerve originates from which of the following locations?

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During examination of the thoracic cage, a student identifie…

During examination of the thoracic cage, a student identifies a rib whose costal cartilage does not attach directly to the sternum but instead joins the costal cartilage of the rib immediately superior to it. Which rib is classified as a vertebrochondral rib?

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The pharynx functions as a __________, whereas the larynx fu…

The pharynx functions as a __________, whereas the larynx function as a ________.

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A student traces blood returning from the pulmonary capillar…

A student traces blood returning from the pulmonary capillaries after gas exchange in the lungs. Which statement correctly describes the next major vessel and direction of blood flow?

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A student traces inspired air from its initial entry into th…

A student traces inspired air from its initial entry into the respiratory system toward the lower respiratory tract. Which structure encountered early in this pathway is classified as part of the upper respiratory tract?

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During dissection of a typical intercostal space, the muscul…

During dissection of a typical intercostal space, the muscular layers are examined from superficial to deep. Which muscle forms the most superficial of the three intercostal muscle layers?

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A student traces inspired air posteriorly from the nasal cav…

A student traces inspired air posteriorly from the nasal cavity before it enters the more inferior portions of the pharynx. Which region of the pharynx does the air enter directly from the nasal cavity?

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A patient develops widespread contraction of airway smooth m…

A patient develops widespread contraction of airway smooth muscle. Constriction of which portion of the respiratory tree would produce the greatest reduction in airflow because its airway diameter is strongly regulated by smooth muscle?

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During forced expiration, contraction of the abdominal wall…

During forced expiration, contraction of the abdominal wall increases intra-abdominal pressure, helping push the diaphragm superiorly and decrease thoracic volume. Which muscle can actively contribute to this process?

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