Dense regular connective tissue is present in

Options

A. Ligament and tendon
B. Joint capsule and Wharton's jelly
C. Periosteum and endosteum
D. Pericardium and heart valves.

Answer

### Step-by-Step Solution:

1. **Understanding Dense Regular Connective Tissue**:
- Dense regular connective tissue is a type of connective tissue characterized by closely packed collagen fibers that are arranged in a parallel manner. This structure provides strength and resistance to pulling forces in one direction.

2. **Identifying Locations of Dense Regular Connective Tissue**:
- The primary locations where dense regular connective tissue is found include ligaments and tendons.
- **Ligaments** connect bones to other bones at joints, while **tendons** connect muscles to bones.

3. **Evaluating the Options**:
- **Option 1: Joint capsule and Watson's jelly**: This is incorrect because the joint capsule contains dense irregular connective tissue, and Watson's jelly contains mucoid connective tissue.
- **Option 2: Periosteum and endosteum**: This is also incorrect as both periosteum and endosteum contain dense irregular connective tissue.
- **Option 3: Pericardium and heart wall**: This option is incorrect as well; the pericardium and heart wall are made up of dense irregular connective tissue.
- **Option 4: Ligament and tendon**: This is the correct answer since dense regular connective tissue is primarily found in these structures.

4. **Conclusion**:
- After evaluating all the options, the correct answer is that dense regular connective tissue is present in **ligaments and tendons**.