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Cyclic contractions of heart muscle are initiated by O a. chemical reactions. O b. the level of oxygen in the blood. O c. electrical impulses. O d. physical exercise.
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Cyclic contractions of heart muscle are initiated by

O a. chemical reactions.
O b. the level of oxygen in the blood.
O c. electrical impulses.
O d. physical exercise.

User Tobifasc
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B : level of oxygen in the blood
User Benjamin Eckstein
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