Gap junctions are present in :

Options

A. Epithelial tissue
B. Cardiac muscules
C. Single unit smooth muscle
D. More than one option is correct

Answer

**Step-by-Step Solution:**

1. **Understanding Gap Junctions:**
- Gap junctions are specialized intercellular connections that allow for direct communication between adjacent cells. They consist of protein channels that enable the transfer of ions and small molecules.

2. **Analyzing the Options:**
- **Option 1: Epithelial Tissue**
- Gap junctions are indeed present in epithelial tissues. They help in cell communication and coordination of functions.
- **Option 2: Cardiac Muscle**
- Gap junctions are crucial in cardiac muscle cells as they allow the depolarizing current to flow between cells, facilitating synchronized contractions of the heart.
- **Option 3: Single Unit Smooth Muscle**
- In single-unit smooth muscle, gap junctions are also present, allowing for coordinated contractions of the muscle fibers.
- **Option 4: More than one option is correct**
- Since options 1, 2, and 3 are all correct, this option is valid.

3. **Conclusion:**
- Since gap junctions are present in epithelial tissue, cardiac muscle, and single-unit smooth muscle, the correct answer is **Option 4: More than one option is correct**.