Why do cardiac muscles never get fatigued?

Explanation

**Step-by-Step Solution:**

1. **Definition of Cardiac Muscles**: Cardiac muscles are specialized muscle tissues found exclusively in the heart. They are involuntary muscles, meaning their contractions are not under conscious control.

2. **Structure of Cardiac Muscles**: The fibers of cardiac muscles are branched and interconnected, forming a network. Each muscle fiber typically contains a single nucleus (uninucleated).

3. **Intercalated Discs**: Cardiac muscle fibers are connected by structures known as intercalated discs. These discs facilitate the rapid transmission of electrical impulses between adjacent fibers, allowing for coordinated contractions.

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