List two structural peculiarities of cardiac muscle fibres ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition and Location**: Cardiac muscle fibers are specialized muscle cells found primarily in the heart. They are responsible for the heart's contraction and overall function.

2. **Striated Appearance**: One of the key structural peculiarities of cardiac muscle fibers is that they are striated. This means they have a striped appearance due to the organized arrangement of actin and myosin filaments, which are responsible for muscle contraction.

3. **Intercalated Discs**: Another important structural feature of cardiac muscle fibers is the presence of intercalated discs. These are specialized connections between adjacent cardiac muscle cells that allow for rapid communication and synchronized contraction of the heart muscle.

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