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

Explanation

To answer the question about the immediate effect of partially non-functional chordae tendineae of the tricuspid valve in the human heart, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Structure**: The tricuspid valve is located between the right atrium and the right ventricle of the heart. It prevents the backflow of blood from the ventricle to the atrium when the ventricle contracts.

2. **Role of Chordae Tendineae**: The chordae tendineae are thread-like structures that anchor the tricuspid valve to the heart muscle (ventricles). They play a crucial role in keeping the valve closed during ventricular contraction, preventing the backflow of blood.

3. **Effect of Injury**: If the chordae tendineae of the tricuspid valve are partially non-functional, this means that they cannot effectively hold the valve in place during the contraction of the right ventricle.

4. **Consequences of Non-Functionality**: When the right ventricle contracts, instead of the blood being pushed forward into the pulmonary artery, some of it will flow back into the right atrium due to the inability of the tricuspid valve to close properly.

5. **Resulting Blood Flow**: This backflow of blood into the right atrium will lead to a reduced amount of blood being ejected into the pulmonary artery, as some of the blood that should go forward is instead going backward.

6. **Conclusion**: Therefore, the immediate effect of the injury to the chordae tendineae of the tricuspid valve will be a reduction in blood flow into the pulmonary artery.

### Final Answer:
The immediate effect of partially non-functional chordae tendineae of the tricuspid valve will be a reduction in blood flow into the pulmonary artery due to backflow of blood into the right atrium.

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