Cardiac muscles use a series of enzymes to maintain a high energy reserve.The enzyme ______ functions to regenerate ATP by combining a phosphate group from an energy-reserve molecule with ADP.The enzyme ______ also ensures adequate ATP levels by combining two ADP molecules into ATP and AMP.The enzyme ______ functions to prevent accumulation of AMP in the muscle.

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For cardiac cells to perform their functions, these cells must maintain a high [ATP]/[ADP] ratio.One way this is achieved is through the synthesis of creatine phosphate, which serves as an energy-reserve source for the regeneration of ATP.The enzyme creatine kinase (CK) functions to regenerate ATP by combining a phosphate group from creatine phosphate with ADP to form ATP.Additionally, the enzyme myokinase (MK) also ensures an adequate level of ATP by combining two molecules of ADP to form ATP and AMP.The enzyme adenosine deaminase (AD) functions to prevent the accumulation of AMP in the muscle.

Cardiac Muscles Use a Series of Enzymes to Maintain a High