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 B
Explanation
A. Bradycardia – Bradycardia is a slow heart rate below 60 beats per minute.
B. Tachycardia – Tachycardia is defined as a heart rate exceeding 100 beats per minute, which can result from fever, stress, dehydration, or cardiac conditions.
C. Dyspnea – Dyspnea refers to difficulty breathing, not an increased heart rate.
D. Tachypnea – Tachypnea is an abnormally rapid respiratory rate, not a rapid heart rate.
Correct Answer is D
Explanation
A. Pathology. – Pathology refers to the study of diseases rather than a condition itself.
B. Condition. – A condition refers to a general state of health but does not necessarily imply a pathological disease process.
C. Injury. – An injury is a specific physical harm or wound, whereas a disease can involve systemic or internal dysfunction.
D. Disease. – A disease is a pathological condition characterized by altered structure or function of the body, leading to signs and symptoms.
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