The connective tissue in which the matrix is not secreted by its component cells is

Options

A. Skeletal
B. Vascular/fluid
C. Dense regular
D. Dense irregular

Answer

To solve the question "The connective tissue in which the matrix is not secreted by its component cells is," we will analyze each option provided and determine which connective tissue fits the criteria.

### Step-by-Step Solution:

1. **Understanding Connective Tissues**:
- Connective tissues are a group of tissues that support, bind together, and protect tissues and organs of the body. They consist of cells and an extracellular matrix.

2. **Identifying the Options**:
- The options given are skeletal, vascular (blood), dense regular, and dense irregular connective tissues.

3. **Analyzing Skeletal Connective Tissue**:
- Skeletal connective tissue includes bone and cartilage. In these tissues, the matrix (bone matrix or cartilage matrix) is secreted by the cells (osteoblasts in bone and chondrocytes in cartilage).
- **Conclusion**: Skeletal connective tissue does not fit the criteria.

4. **Analyzing Vascular (Blood) Connective Tissue**:
- Blood is considered a connective tissue and its matrix is plasma. The plasma contains proteins that are primarily produced by the liver, not by the blood cells themselves (like red blood cells, white blood cells, and platelets).
- **Conclusion**: Vascular (blood) connective tissue fits the criteria as its matrix is not secreted by its component cells.

5. **Analyzing Dense Regular Connective Tissue**:
- Dense regular connective tissue includes tendons and ligaments. The matrix in these tissues is secreted by the fibroblasts, which are the cells present in these tissues.
- **Conclusion**: Dense regular connective tissue does not fit the criteria.

6. **Analyzing Dense Irregular Connective Tissue**:
- Dense irregular connective tissue is found in the dermis of the skin. Similar to dense regular connective tissue, the matrix is secreted by the fibroblasts.
- **Conclusion**: Dense irregular connective tissue does not fit the criteria.

7. **Final Conclusion**:
- The only connective tissue where the matrix is not secreted by its component cells is **vascular (blood) connective tissue**.

### Answer:
The connective tissue in which the matrix is not secreted by its component cells is **vascular connective tissue (blood)**.

---