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Each muscle is composed of many long, cy...

Each muscle is composed of many long, cylindrical fibres arranged in parallel arrays. These fibres are composed of numerous fine fibrils, called

A

Microfilament

B

Myofibrils

C

Microtubule

D

Sarcoplasm

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Muscle Structure**: Each muscle is made up of long cylindrical fibers that are arranged in parallel arrays. These fibers are essential for muscle contraction and overall function. 2. **Identifying the Components of Muscle Fibers**: These muscle fibers are composed of smaller units called fibrils. It is important to identify what these fine fibrils are called. 3. **Analyzing the Options**: The question provides several options to choose from regarding what these fine fibrils are called. The options include: - Microfilament - Myofibrils - Microtubule - Sarcoplasm 4. **Evaluating Each Option**: - **Microfilament**: This is a type of cytoskeleton made of actin, which is not the correct answer for muscle fibrils. - **Myofibrils**: These are indeed the rod-like structures that make up muscle fibers. They are cylindrical and run parallel to each other, making this the correct answer. - **Microtubule**: Another type of cytoskeleton, but not related to muscle fibrils. - **Sarcoplasm**: This refers to the cytoplasm of muscle cells, not the fibrils themselves. 5. **Conclusion**: Based on the analysis, the fine fibrils that compose muscle fibers are called **myofibrils**. ---
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