Which of the following lubricates ligament and tendon and is the important constituent of synovial fluid ?

Options

A. Pectins
B. Lipids
C. Hyaluronidase
D. Hyaluronic acid

Answer

To answer the question "Which of the following lubricates ligament and tendon and is the important constituent of synovial fluid?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**:
- The question provides several options (not listed here, but we will analyze them).

2. **Analyze Each Option**:
- **Option 1: Pectin**:
- Pectin is a structural acidic heteropolysaccharide found in the primary and middle lamella of plants. It does not lubricate ligaments or tendons and is not a component of synovial fluid.
- **Option 2: Lipids**:
- Lipids are primarily components of cell membranes and do not specifically lubricate ligaments or tendons. They are not a significant constituent of synovial fluid.
- **Option 3: Hyaluronidase**:
- Hyaluronidase is an enzyme that breaks down hyaluronic acid and is used to enhance drug absorption. It does not lubricate ligaments or tendons and is not a constituent of synovial fluid.
- **Option 4: Hyaluronic Acid**:
- Hyaluronic acid is a substance that lubricates ligaments and tendons and is a major component of synovial fluid, which reduces friction in joints.

3. **Select the Correct Answer**:
- Based on the analysis, the correct answer is **Hyaluronic Acid** (Option 4).

### Final Answer:
The substance that lubricates ligaments and tendons and is an important constituent of synovial fluid is **Hyaluronic Acid**.

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