Final answer:
An excitable cell can produce an Action potential, a critical electrical signal for quick and reliable communication across the cell membrane, involving ion movements and changes in membrane polarity.
Step-by-step explanation:
An excitable cell is one that can produce a(an) Action potential. An action potential is a rapid change in the electrical potential difference across the cell membrane of an excitable cell, such as a neuron or a muscle cell. It is a special type of electrical signal that can travel along the cell membrane as a wave, allowing for quick and reliable signal transmission over long distances. This process involves depolarization, where the membrane becomes permeable to Na+ ions, and repolarization, where the membrane returns to being impermeable to Na+, allowing K+ ions to move accordingly. This contributes to the membrane potential that is essential for cell signaling and communication.