Final answer:
Excess Ca2+ inside the cell is dealt with through active transport out of the sarcoplasmic reticulum, excretion from the kidneys and intestines, and the involvement of specialized cells in bones.
Step-by-step explanation:
The excess Ca2+ inside the cell is dealt with through various mechanisms. One way is by actively transporting calcium ions out of the sarcoplasmic reticulum, which is a calcium storage compartment in muscle cells. Another way is through the excretion of calcium from the kidneys and intestines. Osteoblasts and osteoclasts, which are specialized cells in bones, also aid in regulating calcium levels.