Cardiac Muscle
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Example:
Imagine you're trying to get a good night's sleep, but your phone keeps buzzing with notifications, waking you up every few minutes. This situation is similar to the cardiac muscle because, just like you can't control the notifications that disturb your sleep, you also can't consciously control the cardiac muscle as it beats continuously without your input. The connection is that both the buzzing phone and the cardiac muscle operate independently of your conscious control—your phone keeps buzzing to keep you informed, and the cardiac muscle keeps contracting to keep you alive.
Practice Version
Cardiac Muscle: An involuntary muscle found only in the heart. Cardiac muscle is a special type of muscle that makes the heart pump blood without us having to think about it.