Q.

Regarding the cardiac muscle action potential, which statement is INCORRECT?

A. sodium ions enter via “fast” channels in phase 0
B. chloride ions may enter cell during phase 1
C. sodium ions enter via “slow” channels in phase 2
D. relative refractory period ends in phase 3
E. class I anti-arrhythmics reduce the slope of phase 4
Answer» A. sodium ions enter via “fast” channels in phase 0
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