____ acts as a shock absorber to cushion when tibia and femur came together

Options

A. Ligament
B. Cartilage
C. Tendon
D. Disc.

Answer

**Step-by-Step Solution:**

1. **Identify the Bones Involved**: The question refers to the tibia and femur, which are the bones of the leg that meet at the knee joint.

2. **Understand the Joint**: The knee joint is the largest joint in the human body and is formed by the femur (thigh bone) and tibia (shin bone), along with the fibula and patella.

3. **Recognize the Function of Cartilage**: In the knee joint, there is a structure known as cartilage that is present between the femur and tibia. This cartilage serves an important function.

4. **Define the Role of Cartilage**: Cartilage acts as a shock absorber, cushioning the impact when the tibia and femur come together during activities such as walking, running, or jumping. It helps to reduce friction and provides stability to the knee joint.

5. **Eliminate Incorrect Options**:
- **Ligament**: Connects bone to bone, not specifically a shock absorber.
- **Tendon**: Connects muscle to bone, not involved in cushioning.
- **Disc**: Refers to intercalated discs in cardiac muscle, not relevant to the knee joint.

6. **Conclude with the Correct Answer**: Based on the above reasoning, the correct answer to the question is **cartilage**.

**Final Answer**: Cartilage acts as a shock absorber to cushion when tibia and femur come together.

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