A characteristic feature of a muscle fibre is the presence of large number of parallel arranged filaments in the sarcoplasm called_____

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Fibres**: Muscle fibres, also known as muscle cells, have specific structural features that differentiate them from other cell types.

2. **Identifying the Sarcoplasm**: Each muscle fibre is surrounded by a plasma membrane called the sarcolemma, which encloses the sarcoplasm. The sarcoplasm is essentially the cytoplasm of the muscle fibre.

3. **Recognizing the Filaments**: A key characteristic of muscle fibres is the presence of numerous parallel arranged filaments within the sarcoplasm.

4. **Naming the Filaments**: These parallel arranged filaments are specifically referred to as myofilaments or myofibrils.

5. **Understanding Myofilaments**: Myofilaments are composed of two types of proteins: actin (thin filaments) and myosin (thick filaments). These proteins are crucial for the muscle contraction process.

6. **Function of Myofilaments**: The primary function of myofilaments is to facilitate muscle contraction through a mechanism known as the sliding filament model.

7. **Final Answer**: Therefore, the characteristic feature of a muscle fibre is the presence of a large number of parallel arranged filaments in the sarcoplasm called **myofilaments** or **myofibrils**.

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