calcium signaling pathway

Calcium signaling is a cellular communication process where calcium ions act as messengers. When a cell receives a signal (like a hormone or neurotransmitter), it triggers the release of calcium ions from storage areas within the cell or brings them in from outside. The increase in calcium levels prompts various cellular activities, such as muscle contractions, hormone secretion, or gene expression. Essentially, calcium acts like a switch, helping cells respond quickly to changes and coordinating different functions within the body, making it a crucial part of many biological processes.