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Cardiac muscles Fibres :-...

Cardiac muscles Fibres `:-`

A

Involunatary

B

Non-fatigue

C

Striated like

D

All

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### Step-by-Step Solution for Cardiac Muscle Fibers 1. **Definition of Cardiac Muscles**: Cardiac muscles are specialized muscle tissues found only in the heart. They are responsible for pumping blood throughout the body. 2. **Characteristics of Cardiac Muscles**: - **Involuntary**: Cardiac muscles function without conscious control. This means that they operate automatically, which is essential for the continuous pumping of blood. - **Striated Appearance**: Under a microscope, cardiac muscle fibers appear striated (striped) due to the arrangement of actin and myosin filaments, similar to skeletal muscles. - **Non-Fatigued**: Cardiac muscles are highly resistant to fatigue. This is due to their rich blood supply and the presence of numerous mitochondria, which provide the necessary energy for sustained contractions. - **Branched Structure**: Cardiac muscle fibers are branched, allowing for a network of interconnected cells that facilitate synchronized contractions. 3. **Conclusion**: All the characteristics mentioned (involuntary, striated, non-fatigued) accurately describe cardiac muscle fibers. Therefore, all the options provided in the question are correct.
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