Select the TRUE statement/s: Calcium channel blocker will affect which phase/s of the cardiac muscle cell action potential? Copyright © McGraw-Hill Education. Permission required for reproduction or display Membrane potential (mv) +30 +10- 10- -30- -50- -70- -90 1 OA) Phase 1 B) Phase 2 (b) Electrical events at the sarcolemma of a cardiac muscle cell OC) Phase 3 0.15 Time (seconds) OD) Phase 4 RMP OE) All of the above 0.30

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