Assertion: cardiac muscle's cell | /r/HasAspect | three different pumps
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text: contractile cell: relaxation relaxing cardiac muscle cell - the cell has three different pumps that work around the clock to keep cytosolic Ca levels low, they include the plasma membrane Ca-ATPase pump (PMCA) and Na/Ca exchanger (NCX) that efflux Ca out of the cell and the sarcoplasmic/endoplasmic reticulum Ca-ATPase (SERCA) that effluxes