Which of the following muscles bend the forearm upwards?

Options

A. Biceps
B. Triceps
C. Gastrocnemius
D. Gluteus maximus

Explanation

To determine which muscle bends the forearm upwards, we can analyze the options provided:

1. **Identify the muscles listed in the options**:
- Biceps
- Triceps
- Gastrocnemius
- Gluteus maximus

2. **Understand the function of each muscle**:
- **Biceps**: This muscle is located in the upper arm and is primarily responsible for flexing the elbow joint, which bends the forearm upwards.
- **Triceps**: This muscle is located at the back of the upper arm and is responsible for extending the elbow joint, which straightens the arm.
- **Gastrocnemius**: This muscle is located in the calf and is involved in movements of the ankle joint, not the forearm.
- **Gluteus maximus**: This muscle is located in the buttocks and is primarily responsible for hip extension, not the movement of the forearm.

3. **Determine the correct answer**:
- Since the biceps muscle is the one that flexes the elbow and bends the forearm upwards, the correct answer is **Biceps**.

### Final Answer:
The muscle that bends the forearm upwards is the **Biceps**.