The anatomical unit of muscle is

Options

A. muscle fibre
B. Sarcomere
C. filaments
D. Sutures

Answer

To solve the question "The anatomical unit of muscle is," we will analyze each of the provided options step by step.

### Step 1: Analyze the first option - Muscle Fiber
- **Definition**: Muscle fibers are the individual cells that make up muscle tissue. They are long, cylindrical, and multinucleated.
- **Function**: Muscle fibers are responsible for muscle contraction and are often referred to as the basic anatomical unit of muscle.
- **Conclusion**: This option is correct.

### Step 2: Analyze the second option - Sarcomere
- **Definition**: A sarcomere is the basic functional unit of a muscle fiber. It is the segment of a myofibril between two Z lines.
- **Function**: Sarcomeres are responsible for the striated appearance of skeletal muscle and are involved in the contraction process.
- **Conclusion**: This option is incorrect as it refers to a functional unit rather than an anatomical unit.

### Step 3: Analyze the third option - Filaments
- **Definition**: Filaments refer to the myofilaments within the sarcomeres, which include actin (thin filaments) and myosin (thick filaments).
- **Function**: While they play a crucial role in muscle contraction, they are not considered the anatomical unit of muscle.
- **Conclusion**: This option is incorrect.

### Step 4: Analyze the fourth option - Sutures
- **Definition**: Sutures are the immovable joints between the bones of the skull.
- **Function**: They are not related to muscle anatomy.
- **Conclusion**: This option is incorrect.

### Final Answer
Based on the analysis, the correct answer to the question "The anatomical unit of muscle is" is **Muscle Fiber**.

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