Which of the following parts of an EKG occurs during ventricular depolarization?
QRS complex
T wave
P wave
PQ segment
The Correct Answer is A
A. QRS complex: The QRS represents the rapid depolarization of the right and left ventricles (electrical activity that triggers ventricular contraction).
B. T wave: The T wave represents ventricular repolarization (the ventricles recovering electrically), not depolarization.
C. P wave: The P wave represents atrial depolarization, the electrical activation of the atria.
D. PQ segment: The PQ (PR) segment is the brief isoelectric period while the impulse travels through the AV node/AV bundle (a conduction delay), not ventricular depolarization.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Diapedesis (transmigration): the cell is shown squeezing through the vessel wall (leaving the bloodstream), which is diapedesis (also called extravasation).
B. Phagocytosis: phagocytosis is ingestion of particles/pathogens by a phagocyte; the image shows movement out of a vessel, not engulfment of material.
C. Chemotaxis: Incorrect (related but not the pictured action) -chemotaxis is directed movement toward chemical signals; a leukocyte may chemotax once in the tissue, but the image specifically shows the mechanical passage through the endothelium (diapedesis).
D. Margination/Rolling: margination/rolling are earlier steps along the endothelium where leukocytes slow and adhere; the image shows a cell already squeezing through the wall, which is the next step (diapedesis).
Correct Answer is {"dropdown-group-1":"B"}
Explanation
Correct answer: Median cubital vein
The vein running diagonally across the anterior elbow (antecubital fossa) is the median cubital vein, the usual communicating vein between cephalic and basilic veins and a common site for venipuncture.
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