Sir in this particular video you told that, when the muscle relaxation happen the calcium is removed from the troponin c by the use of ATP and get back into the sarcoplasm, after this you have told that sarcoplasmic reticulum actively reuptake and the calcium Ion into the sarcoplasmic reticulum, what is the meaning of actively reuptake and what is the meaning of activity here, does it mean that the calcium is Re up taken into sarcoplasmic reticulum by the use of energy by the breaking of ATP into ADP thank you sir