What component of the conduction system is referred to as the pacemaker of the heart?
Atrioventricular (AV) node
Bundle branches
Bundle of His
Sinoatrial (SA) node
The Correct Answer is D
A. Atrioventricular (AV) node: The AV node conducts electrical signals from the atria to the ventricles, but it is not the pacemaker of the heart.
B. Bundle branches: The bundle branches transmit the electrical impulses to the ventricles but are not the primary pacemaker.
C. Bundle of His: The Bundle of His conducts electrical signals from the AV node to the bundle branches and ventricles but does not act as the pacemaker.
D. Sinoatrial (SA) node: The SA node, located in the right atrium, is the primary pacemaker of the heart, initiating electrical impulses that regulate heart rhythm.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","E"]
Explanation
A. The timing of the murmur (systolic or diastolic) is an essential component of murmur assessment. It
helps in determining the cause of the murmur, whether it’s related to heart valves or flow.
B. Radiation refers to where the murmur can be heard best, or if it radiates to other parts of the chest or neck, helping to indicate the origin of the murmur.
C. Fremitus is a term used to describe the vibrations felt on the chest wall when a person speaks, which is unrelated to heart murmurs.
D. Egophony refers to an abnormal lung sound heard during auscultation and is not relevant to the assessment of a heart murmur.
E. The location where the murmur is heard best on the chest wall is crucial in determining its origin, such as whether it is coming from the aortic or mitral valve.
Correct Answer is B
Explanation
A. Increased tactile fremitus and dull percussion tones would suggest consolidation or pathology, which is not normal.
B. Muffled voice sounds and symmetric tactile fremitus are normal findings in healthy lung tissue.
C. Adventitious sounds and limited chest expansion would indicate pathology such as pneumonia or other lung diseases.
D. Absent voice sounds and hyper resonant percussion tones would be indicative of a pneumothorax or emphysema, not normal lung findings.
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