If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells,________.
A) contractions would last as long as the refractory period
B) tetanic contractions might occur, which would stop the heart's pumping action
C) pacemaker cells would cease to spontaneously depolarize
D) it would be much longer before cardiac cells could respond to a second stimulation

Question

Quizplus · Accepted Answer

In skeletal muscle cells, tetanic contractions occur when multiple action potentials are fired in rapid succession before the completion of the absolute refractory period. However, in cardiac muscle cells, the absolute refractory period is longer to prevent tetanic contractions and ensure proper pumping action of the heart. If the refractory period was as short as it is in skeletal muscle cells, tetanic contractions could occur in the heart and disrupt its normal pumping action.

If the Length of the Absolute Refractory Period in Cardiac