1. Cation-transporting proteins that utilize the energy of ATP Hydrolysis for the transport of calcium. They differ from calcium channels which allow calcium to pass through a membrane without the use of energy. (online-medical-dictionary.org)
2. Calcium ATPase is a form of P-ATPase that transfers calcium after a muscle has contracted. The calcium ATPase are:
Plasma Membrane Calcium ATPase (PMCA)
Sarcoplasmic Reticulum Calcium ATPase (SERCA) (Wikipedia.org)