[Solved] Which disorder is the least common? A)Klinefelter's syndrome B)XYY complement C)Turner's syndrome D)XXX syndrome Action Potentials: Brief electrical impulses that serve as the fundamental signaling processes of nerve cells, enabling communication throughout the nervous system. Neurons: Cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells. Glia: Non-neuronal cells in the central nervous system that support, protect, and nourish neurons. Sodium Ions: Positively charged atomic particles of sodium, essential in the body for maintaining blood pressure and fluid balance, and facilitating nerve and muscle functions.