Auscultation of the heart sounds will result in a lubb-dupp sound when using the bell and the diaphragm of the stethoscope. The lub part of the sound is caused by the:
opening of the AV valves
closing of the semilunar valves
closing of the AV valves
opening of the semilunar valves
The Correct Answer is C
A. Opening of the AV valves – The AV (atrioventricular) valves open silently during diastole; they do not create the "lub" sound.
B. Closing of the semilunar valves – The closing of the semilunar valves (aortic and pulmonary) produces the "dupp" sound, not the "lub."
C. Closing of the AV valves – The first heart sound (S1), or "lub," occurs when the mitral and tricuspid (AV) valves close at the beginning of systole.
D. Opening of the semilunar valves – The semilunar valves open silently during ventricular contraction; they do not produce the "lub" sound.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Infection. – Infection refers to the invasion of body tissues by microorganisms, while inflammation is the body’s response to injury or infection.
B. Ecchymosis. – Ecchymosis refers to bruising caused by blood leakage under the skin, not a protective response.
C. Erythema. – Erythema is redness of the skin due to increased blood flow, which is a symptom of inflammation but not the process itself.
D. Inflammation. – Inflammation is the body’s protective response to injury, infection, or irritation. It involves increased blood flow, immune cell activation, and chemical mediators to promote healing.
Correct Answer is A
Explanation
A. Prevent distortion of bowel sounds. – Palpation can stimulate peristalsis and alter bowel sounds, leading to inaccurate assessment findings.
B. Prevent distortion of vascular sounds. – While palpation might affect vascular sounds slightly, this is not the primary concern when assessing the abdomen.
C. Determine any areas of tenderness or pain. – While assessing for tenderness is important, auscultation precedes palpation primarily to avoid altering bowel sounds.
D. Allow the patient to relax and be comfortable. – While relaxation is beneficial, the sequence of assessment is based on maintaining accuracy in findings rather than patient comfort.
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