codyridner
codyridner codyridner
  • 11-02-2021
  • Health
contestada

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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trinity5268
trinity5268 trinity5268
  • 11-02-2021
B : level of oxygen in the blood
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