What is the Valsalva maneuver used for?
To produce louder speech sounds
To increase vocal pitch during singing
To amplify sound in the oral cavity
To stabilize the body during heavy lifting or defecation
The Correct Answer is D
A. To produce louder speech sounds: While some vocal techniques involve breath control, the Valsalva maneuver is not intended for modulating speech volume. Its primary physiological effect is on intrathoracic pressure rather than acoustic amplification.
B. To increase vocal pitch during singing: Vocal pitch is adjusted by tension in the vocal cords, not by the Valsalva maneuver. Using this maneuver for singing could actually restrict airflow and reduce vocal efficiency.
C. To amplify sound in the oral cavity: Amplifying sound relies on resonance in the vocal tract, not on increased intrathoracic or abdominal pressure. The Valsalva maneuver does not function to enhance oral cavity sound resonance.
D. To stabilize the body during heavy lifting or defecation: The Valsalva maneuver involves a forceful exhalation against a closed glottis, increasing intrathoracic and intra-abdominal pressure. This provides core stabilization for heavy lifting, straining during defecation, or activities requiring trunk support, making it its primary functional use.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Correct answer: False
Terminal bronchioles represent the smallest airways in the conducting zone of the respiratory system and do not directly open into alveoli. Instead, they transition into respiratory bronchioles, which are the initial structures of the respiratory zone capable of gas exchange. The respiratory bronchioles then branch into alveolar ducts, which terminate in clusters of alveoli where the majority of gas exchange occurs. This anatomical progression ensures that air is conducted efficiently through the bronchiolar tree while maintaining separation between the conducting and respiratory zones. Therefore, stating that terminal bronchioles directly enter the alveoli is inaccurate and does not reflect the true structural organization of the lungs.
Correct Answer is A
Explanation
A. Horizontal fissure: The horizontal fissure, also called the minor fissure, runs transversely across the right lung and separates the superior (upper) lobe from the middle lobe. This anatomical feature is unique to the right lung and is critical for distinguishing lobar divisions during imaging or surgical procedures.
B. Costal surface: The costal surface refers to the portion of the lung that lies adjacent to the ribs. It does not define lobar boundaries but provides contact with the thoracic cage, aiding in lung expansion and protection.
C. Oblique fissure: The oblique fissure, or major fissure, is present in both lungs and separates the superior lobe from the inferior lobe. In the right lung, it runs diagonally from the vertebral surface to the costal surface but does not divide the superior and middle lobes.
D. Apex: The apex is the superior tip of the lung extending into the thoracic inlet. It does not serve as a boundary between lobes but rather defines the uppermost portion of the lung.
E. Cardiac notch: The cardiac notch is an indentation on the medial surface of the left lung to accommodate the heart. It is absent on the right lung and therefore unrelated to right lung lobar separation.
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