Describe the key features of cardiac muscle and explain why it is unique among muscle tissues.
BiologyClass 9CBSEAnswered 13 May 2026
Answer
Cardiac muscle is found exclusively in the wall of the heart. Its key features include:
1. Striated: Similar to skeletal muscle, it exhibits a striped appearance due to the arrangement of contractile proteins.
2. Involuntary: Its contractions are not under conscious control.
3. Branched: Cardiac muscle cells are branched and interconnected by specialized junctions called intercalated discs.
4. Uninucleate: Each cell typically contains a single nucleus.
It is unique because it combines features of both skeletal (striations) and smooth (involuntary control) muscle, but its branched structure and intercalated discs allow for rapid and synchronized contraction of the entire heart, essential for efficient blood pumping.
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