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 B
Explanation
A. Assess the forearm and hand for infection would be relevant if the swollen lymph node were in the upper extremity, but the inguinal node would be more associated with a lower extremity infection.
B. Assess the lower extremities is the correct next step since the inguinal lymph nodes drain the lower body, including the legs and genital area.
C. Assess the dorsalis pedis pulses is not the next step, though it may be important if vascular concerns are suspected.
D. None of the above is incorrect because assessing the lower extremities is the next logical step.
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.
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