1)Action potential repolarization: Potassium ions leave the cell, causing repolarization of the T-tubules and closure of VGCCs, reducing calcium influx.

2)Extrusion of calcium from the cell: Calcium is pumped out of the cell, primarily through the Na^+/Ca^2+ exchanger, contributing to around 30% of calcium removal.

3)Uptake of calcium into the sarcoplasmic reticulum (SR): Calcium ions are actively transported back into the SR via the SR membrane Ca^2+-ATPase pump, accounting for approximately 70% of calcium removal.

4)Storage of calcium in the SR for future contractions: Calcium is stored in the SR to be released during the next contraction. Even relaxation requires energy in the form of ATP.

5)Uptake of calcium into mitochondria: Some calcium ions are taken up by mitochondria, helping to maintain calcium homeostasis

Review: Cardiac Contraction (Physiology)