If due to some injury the chordae tendineae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect ?

Options

A. The flow of blood into the pulmonary artery will be reduced
B. The flow of blood into the aorta will be slowed down
C. The 'pacemaker' will stop working
D. The blood will tend to flow back into the left atrium

Answer

To address the question regarding the immediate effect of partially non-functional chordae tendineae of the tricuspid valve in the human heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of Chordae Tendineae**:
- The chordae tendineae are fibrous cords that connect the papillary muscles to the cusps of the heart valves, specifically the tricuspid valve in this case. They play a crucial role in ensuring that the valve closes properly during ventricular contraction.

2. **Function of the Tricuspid Valve**:
- The tricuspid valve is located between the right atrium and the right ventricle. Its main function is to prevent the backflow of blood from the right ventricle into the right atrium during ventricular contraction (systole).

3. **Effect of Injury to Chordae Tendineae**:
- If the chordae tendineae are partially non-functional, the tricuspid valve may not close completely. This incomplete closure can lead to regurgitation, where some blood flows back into the right atrium instead of moving forward into the pulmonary artery.

4. **Immediate Consequence**:
- The immediate effect of this malfunction would be a reduction in the efficiency of blood flow from the right ventricle into the pulmonary artery. This is because the tricuspid valve cannot fully prevent backflow, thus affecting the pressure and volume of blood being pumped into the pulmonary circulation for oxygenation.

5. **Conclusion**:
- Therefore, the immediate effect of partially non-functional chordae tendineae of the tricuspid valve is that the flow of blood into the pulmonary artery will be reduced.

### Final Answer:
The immediate effect of partially non-functional chordae tendineae of the tricuspid valve is that the flow of blood into the pulmonary artery will be reduced.

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