Which of the following is the most important muscle in the normal respiratory process of an adult?
Trapezius
Diaphragm
Rectus abdominus
Sternocleidomastoid
The Correct Answer is B
A. Trapezius: The trapezius is a muscle of the upper back and neck and does not play a primary role in normal respiration.
B. Diaphragm: The diaphragm is the most important muscle for respiration. It contracts and moves downward during inhalation, increasing the thoracic cavity's volume and drawing air into the lungs.
C. Rectus abdominus: The rectus abdominus is a core muscle that helps in forced expiration but is not essential in normal breathing.
D. Sternocleidomastoid: This muscle assists with forced inspiration, but it is not the primary muscle for regular breathing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. 2nd intercostal space right of the sternal border is the correct location for auscultating the aortic valve.
B. 5th intercostal space medial to the mid-clavicular line is the location for the mitral valve.
C. 2nd intercostal space left of the sternal border is the location for auscultating the pulmonic valve.
D. 4-5th intercostal space left of the sternal border is where the tricuspid valve is auscultated.
Correct Answer is D
Explanation
A. Top-to-bottom comparison is not the best method for auscultation. A more systematic approach is needed.
B. Posterior-to-anterior comparison does not apply to all auscultation areas, and a consistent method across the thorax is preferred.
C. Interspace-by-interspace comparison involves comparing sounds across different intercostal spaces but is not a method for transitioning between sites.
D. Side-to-side comparison ensures the nurse is assessing both sides of the thorax equally and systematically, which is the correct approach.
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