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
Explanation
A. Ulcer refers to a wound with a loss of epidermis and dermis, often irregular and deeper, potentially bleeding.
B. Erosion involves a shallow loss of the epidermis only, not extending into the dermis.
C. Nodule is a solid, raised lesion that is typically firm and not ulcerated.
D. Cyst is a sac-like structure containing fluid or semi-solid material, not a wound with loss of tissue.
Correct Answer is C
Explanation
A. Palpation of the thyroid helps assess its size, consistency, and tenderness but does not aid in detecting a bruit.
B. Swallowing helps assess the mobility of the thyroid but does not aid in auscultating for a bruit.
C. The bell of the stethoscope is used to detect low-pitched sounds, such as a bruit, which might be heard if there is increased blood flow through the thyroid gland, as seen in hyperthyroidism or Graves' disease.
D. The diaphragm is used to detect high-pitched sounds, such as lung or heart sounds. The bell is better for detecting a bruit.
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