Chordie tendinae are made of

Options

A. elastic fibres
B. nerve fibres
C. collagen fibres
D. muscle fibres

Answer

To answer the question about what chordae tendineae are made of, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chordae Tendineae**:
- Chordae tendineae are fibrous cords that connect the papillary muscles to the atrioventricular valves (the mitral and tricuspid valves) in the heart. They play a crucial role in preventing the valves from inverting during ventricular contraction.

2. **Analyzing the Options**:
- **Option 1: Elastic fibers** - While elastic fibers are important in various tissues, they are not the primary component of chordae tendineae.
- **Option 2: Nerve fibers** - Nerve fibers are not involved in the structure of chordae tendineae.
- **Option 3: Collagen fibers** - Collagen is a major structural protein found in various connective tissues, including the chordae tendineae.
- **Option 4: Muscle fibers** - Muscle fibers are not present in chordae tendineae as they are not muscular structures.

3. **Identifying the Correct Composition**:
- The chordae tendineae are primarily composed of collagen fibers, specifically types 1 and 3. These collagen fibers provide strength and stability to the chordae tendineae, enabling them to withstand the forces exerted during heart contractions.

4. **Conclusion**:
- Based on the analysis, the correct answer to the question is **Option 3: Collagen fibers**.