What are the other roles of calcium ions inside the cell other than in muscle contraction?

Role of Calcium ions in the cells

Other than helping in muscle contraction, calcium ions are very important in various ways like;

Calcium ions are the key players in many biochemical and physiological processes in the cells. They take part in the signal transduction pathways as second messengers to trigger neurotransmitter release from neurons. This activates various cellular activities like excitability, motility, exocytosis, transcription, and apoptosis. Calcium ions take part in electrical signals and control the heart functions. It is also necessary to pump blood from the heart. Calcium ions function as a co-factor and facilitate blood clotting .

It would be the equator