The muscles which contract to produce opposite movements at the same joint are called

Options

A. synergists
B. antagonists
C. prime movers
D. none of these

Answer

To answer the question, "The muscles which contract to produce opposite movements at the same joint are called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Muscle Classification**: Muscles in the body can be classified based on their functions. It's important to know the different types of muscle actions.

2. **Identify the Types of Muscles**: The two main types of muscles relevant to this question are:
- **Synergistic Muscles**: These muscles work together to perform the same movement.
- **Antagonistic Muscles**: These muscles produce opposite movements at the same joint.

3. **Define Antagonistic Muscles**: Antagonistic muscles are those that contract to create movements that oppose each other. For example, when one muscle contracts to bend a limb, the other muscle contracts to straighten it.

4. **Provide Examples**: A classic example of antagonistic muscles is the biceps and triceps:
- **Biceps**: This muscle flexes (bends) the arm.
- **Triceps**: This muscle extends (straightens) the arm.

5. **Conclusion**: Based on the definitions and examples, the muscles that contract to produce opposite movements at the same joint are called **antagonistic muscles**.

### Final Answer:
The muscles which contract to produce opposite movements at the same joint are called **antagonistic muscles**.

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