Depriving your heart muscles with Calcium can lower your blood pressure.-By Dr Harold Gunatillake Transcript: The drugs used are called Calcium channel blockers Let us talk about them. During contraction of the heart muscles to pump blood to the periphery and simultaneously receiving the venous blood, calcium particles in the blood seems to enter the heart muscle cells with each contraction, and also the calcium contribute to the electrical signaling that coordinates the heart function, by slowing down the electrical impulses initiated by the sinoatrial node (SA-node), which gives you a lower pulse rate. It is also important to have the right concentration of potassium in the blood for the calcium to act. If there is high potassium concentration in your blood that can cause cardiac arrest because the calcium found within heart muscle cells seem to be pumped out. So, it is important to check your blood potassium level ...