Choose the answer that correctly follows the path of electricity conduction through the heart?
SA node (sinoatrial node), AV node (atrio-ventricular node), Bundle of His, Purkinje fibers
AV node (atrio-ventricular node), Bundle of His, Purkinje fibers, SA node (sinoatrial node)
SA node (sinoatrial node), Purkinje fibers, Bundle of His, AV node (atrio-ventricular node)
Bundle of His, Purkinje fibers, SA node (sinoatrial node), AV node (atrio-ventricular node)
The Correct Answer is A
A. SA node (sinoatrial node), AV node (atrio-ventricular node), Bundle of His, Purkinje fibers: This is the normal electrical conduction sequence -SA node generates impulse → brief delay at AV node → impulse travels down Bundle of His and right/left bundle branches to Purkinje fibers for ventricular conduction.
B. AV node, Bundle of His, Purkinje fibers, SA node: This sequence reverses the normal pacemaker order and does not represent physiologic conduction.
C. SA node, Purkinje fibers, Bundle of His, AV node: Purkinje fibers and Bundle of His conduct after the AV node delay; placing Purkinje before Bundle of His and AV node does not reflect actual conduction order.
D. Bundle of His, Purkinje fibers, SA node, AV node: This mixes secondary conduction structures before the primary pacemaker and is not the physiological pathway.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Vitamin D: Important for calcium/phosphate balance and has immune roles, but it is not the key vitamin for collagen synthesis.
B. Vitamin K: Required for activation of clotting factors and some bone proteins, not directly for collagen production.
C. Vitamin C: Essential as a cofactor for proline and lysine hydroxylation during collagen synthesis and supports immune function; deficiency impairs collagen formation.
D. Vitamin A: Important for vision, epithelial health, and immune function, but not directly required for collagen hydroxylation.
Correct Answer is B
Explanation
A. Smooth ER: Involved in lipid synthesis, detoxification, and calcium storage in some cells, not the primary ATP generator.
B. Mitochondria: Organelles that perform oxidative phosphorylation and produce most of the cell’s ATP (energy).
C. Golgi apparatus: Modifies, sorts, and packages proteins and lipids for secretion or delivery to organelles, not energy production.
D. Ribosome: Sites of protein synthesis (translate mRNA), not the main source of cellular energy.
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