kiranmayi
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Maximal ventricular Na+ channel conductance occurs during which phase of the ECG?
A. P wave
B. QRS interval
C. ST interval
D. T wave
E. U wave
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| bb
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B?
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| asmi
Forum Hero
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A ??
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| kiranmayi
Forum Guru
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The correct answer is B. Phase 0 of the cardiac muscle action potential (AP) corresponds to the opening of voltage-dependent sodium channels, causing a transient but large increase in sodium conductance during ventricular depolarization. The shape of the QRS complex of the ECG is determined by the spread of the combined phase 0 (depolarization) of all the ventricular muscle of the heart.
The P wave (choice A) corresponds to atrial depolarization.
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| asmi
Forum Hero
Topics: 1043
Posts: 4,609
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ohh! my mistake ,
you asked about ventricle and i was thinking about atrial #-o
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