Which of the following types of muscles is involuntary, and contains intercalated disc. A) smooth muscle B) skeletal muscle C) cardiac muscle D) visceral muscle
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Cardiac muscle is the superstar of involuntary muscles! It's unique because it has intercalated discs, which are special junctions that allow the heart cells to communicate quickly and contract in unison. This is crucial for maintaining the rhythm of your heartbeat, ensuring that your blood pumps efficiently throughout your body. Smooth muscle, on the other hand, is also involuntary but lacks those cool intercalated discs. You’ll find smooth muscle in places like your digestive tract, where it works tirelessly to aid in digestion without you having to think about it. So, while both muscle types are involuntary, cardiac muscle is the one with the intercalated disc party!