THE BIOCHEMICAL CALCIUM SIGNAL
Abstract
When we refer to calcium, everyone can establish a relationship with teeth and bones. It can be also rela¬ted with the cardiac action potential or even with the action of vitamin D and the parathyroid hormone. Nevertheless, the Ca2+ ion plays a much more subtle biochemical function related with activation of intracellular processes. In this case, the arrival of an external stimulus (physical, chemical or electrical) to the cell induces a transient increase in cytoplasmic Ca2+ (the Ca2+ signal) giving nse to different intracellular respon¬ses. Therefore, Ca2+ has a role as intracellular regulator. The mechanism of muscle contraction illustrates this essential function of Ca2+inside the cell.Downloads
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