Physiology True about cardiac muscle A Cardiac muscle cannot be tetanized due to long absolute refractory period B Gap junctions in intercalated discs provide strong union between muscle fibers C T tubules located at A-I junction D Phase 2 of cardiac muscle action potential is due to opening of K+ channels 💡 Explanation True about cardiac muscle ✓ Correct Answer: A. Cardiac muscle cannot be tetanized due to long absolute refractory period