voltage-gated calcium channels

Voltage-gated calcium channels are proteins in cell membranes that open in response to changes in voltage (electricity) across the membrane. When they open, calcium ions enter the cell, which is crucial for various cellular activities. These channels play a key role in muscle contraction, neurotransmitter release in nerve cells, and hormone secretion. Essentially, they help cells communicate and respond to signals from the body by allowing calcium, an important messenger, to flow in when needed. Proper functioning of these channels is vital for many physiological processes.