What makes it impossible for the myocardium to go into tetany?
a. Absolute refractory period
b. Automaticity
c. Cardiac myofibrils
d. Intercalated discs
ANS: A
Unlike those of other muscle tissues, however, cardiac contractions cannot be sustained or teta-nized because myocardial tissue exhibits a prolonged period of inexcitability after contraction. The period during which the myocardium cannot be stimulated is called the refractory period.
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