Which cardiac conduction system component follows the SA node?
AV node
Bundle of His
Purkinje fibers
AV bundle
The Correct Answer is A
A. AV node: The impulse travels from the SA node through atrial pathways to the AV node next—this is the normal sequence.
B. Bundle of His: Comes after the AV node, not immediately after the SA node.
C. Purkinje fibers: Terminal conduction fibers in the ventricles; far downstream from the SA node.
D. AV bundle: Another name for the Bundle of His, which still comes after the AV node.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. To produce antibody molecules: plasma cells are differentiated B cells specialized for synthesizing and secreting antibodies.
B. To directly attack cells displaying antigens: cytotoxic T lymphocytes (and NK cells) directly attack antigen-bearing cells; plasma cells primarily secrete antibodies.
C. To increase the volume of the blood plasma: plasma cell activity does not change plasma volume; they produce proteins (antibodies), not fluid volume.
D. To produce interferon: many cell types secrete interferons in response to viral infection (e.g., infected cells, immune cells), but plasma cells are dedicated antibody producers.
Correct Answer is C
Explanation
A. Bound to the globin portion of hemoglobin: Oxygen binds the heme (iron) portion, not the globin protein chains
B. Dissolved in the plasma: Only a small fraction (~1.5%) of O₂ is dissolved in plasma
C. Bound to the heme portion of hemoglobin: Most O₂ (~98–99%) is carried as oxyhemoglobin bound to heme iron
D. In the form of bicarbonate and water: Bicarbonate transport applies to CO₂, not O₂
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