Here's why:
* Large Number of Cells: The heart is composed of millions of individual muscle cells called cardiomyocytes. These cells are interconnected by specialized junctions called intercalated discs.
* Membrane Depolarization: The coordinated contraction of the heart relies on electrical signals that travel through the cardiomyocytes. This electrical signal involves a change in the membrane potential of the cells, known as depolarization.
* Importance of Depolarization: The depolarization wave spreads rapidly throughout the heart, ensuring that the muscle cells contract in a synchronized manner to pump blood effectively.
Let me know if you have any other questions.
