The matrix of the connective tissue is  

Options

A. modified polysaccharide secreted by the cells of connective tissue
B. modified polysaccharide secreted by blood cells
C. unchanged monosaccharides secreted by epithelial cells
D. broken down products of connective tissue cells

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the matrix of connective tissue. We need to identify what constitutes this matrix.

2. **Analyzing the Options**: We have four options to consider:
- A) Modified polysaccharide secreted by the cells of connective tissue
- B) Modified polysaccharide secreted by blood cells
- C) Unchanged polysaccharide secreted by epithelial cells
- D) Broken down products of connective tissue cells

3. **Eliminating Incorrect Options**:
- **Option C**: Epithelial cells are not part of connective tissue; they form a different type of tissue known as epithelium. Therefore, this option can be eliminated.
- **Option B**: While blood is a type of connective tissue, the matrix of connective tissue is not specifically secreted by blood cells. Thus, this option is also not correct.
- **Option D**: The matrix is not made up of broken down products of connective tissue cells; it is actively secreted by the cells. Hence, this option can be eliminated as well.

4. **Identifying the Correct Option**:
- **Option A**: This states that the matrix is a modified polysaccharide secreted by the cells of connective tissue. This aligns with our understanding that the extracellular matrix (ECM) of connective tissue is primarily composed of proteins and polysaccharides, which are secreted by the connective tissue cells (such as fibroblasts).

5. **Conclusion**: The correct answer is **Option A**: Modified polysaccharide secreted by the cells of connective tissue.