bio question~~urgent!!! help please~~

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Which of the following statements BEST describes the strength of cardiac muscle contraction? It is
Decreased when extracellular Ca is increased
Increased when extracellular Ca is increased
 
Which of the following statements BEST describes the strength of cardiac muscle contraction? It is
Decreased when extracellular Ca is increased
Increased when extracellular Ca is increased

Increased when extracellular Ca is increased...need calcium for muscle contraction
 
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