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. The movement of white blood cells through blood vessel walls: diapedesis (transmigration) is when leukocytes squeeze between endothelial cells to leave the bloodstream and enter tissues.
B. The formation of platelets from megakaryocytes: that process is thrombopoiesis (platelet production), not diapedesis.
C. The squeezing of red blood cells through narrow capillaries: RBCs deform to pass through capillaries, but that is not called diapedesis.
D. The filling of red blood cells with hemoglobin: hemoglobin synthesis and RBC maturation are separate processes, not diapedesis.
Correct Answer is A
Explanation
A. pepsin: pepsin (activated from pepsinogen) is the primary enzyme that begins protein digestion in the stomach.
B. amylase: amylase digests carbohydrates, primarily in the mouth/small intestine, not proteins in the stomach.
C. intrinsic factor: intrinsic factor (from parietal cells) is needed for vitamin B₁₂ absorption, not protein digestion.
D. lipase: lipase digests fats; gastric lipase plays a minor role but is not the main stomach protease.
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