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 C
Explanation
A. Adrenal: The adrenal glands produce hormones like cortisol and adrenaline, but not thyroxine.
B. Parotid: The parotid glands are salivary glands and are unrelated to thyroxine production.
C. Thyroid: The thyroid gland produces thyroxine (T4), and elevated levels of this hormone indicate that the thyroid gland should be assessed for potential hyperthyroidism.
D. Parathyroid: The parathyroid glands regulate calcium levels but do not produce thyroxine.
Correct Answer is B
Explanation
A. This is a vibration felt on the chest wall when a patient speaks, often used to assess lung sounds. It is not associated with the crackling sensation described here.
B. The coarse, crackling sensation felt on the skin surface when palpating is crepitus, which occurs when air escapes into the subcutaneous tissue, often due to trauma, infection, or the presence of a pneumothorax.
C. These are abnormal lung sounds, such as crackles, wheezes, or rhonchi, heard with a stethoscope during auscultation, not felt on the chest wall during palpation.
D. A friction rub is a grating or scraping sound heard with a stethoscope, typically due to inflammation of the pleural surfaces. It is not a sensation felt on the chest wall.
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