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 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 D
Explanation
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.
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