Intracellular calcium signaling

Intracellular calcium signaling refers to the process by which cells use calcium ions (Ca²⁺) to communicate and regulate various functions. When a cell receives a signal—like a hormone or neurotransmitter—it often leads to an increase in calcium levels inside the cell. This change in calcium concentration activates several proteins and pathways, influencing essential activities such as muscle contraction, neurotransmitter release, and cell growth. Essentially, calcium acts as a crucial messenger within the cell, helping to coordinate complex processes and maintain proper cellular function.