Cardiac muscles Fibres `:-`

Options

A. Involunatary
B. Non-fatigue
C. Striated like
D. All

Answer

### 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.