The muscles that govern movement in our body are striated muscles, and each muscle cell in striated muscles has many receptors, which we can think of as a signal receiving and transmitting station. When we need to move, the brain nerves will send a signal to this station, which then controls muscle movement. A very important ion in muscle movement is the calcium ion. There is a receptor for calcium ions on our muscle cells, and it is related to the concentration of blood potassium. When the concentration of blood potassium is too low, a condition known as hypokalemia, or too high, known as hyperkalemia, the calcium ion receptor will be inhibited. At this point, our muscles will exhibit symptoms of muscle weakness.