A heart murmur indicates a defective

Options

A. Bundle of His
B. Heart valves
C. Sinuauricular node
D. Atrioventricular node

Answer

**Step-by-Step Solution:**

1. **Understanding Heart Murmurs**: A heart murmur is an abnormal sound produced by turbulent blood flow within the heart. It can indicate various conditions, including defects in heart structures.

2. **Identifying the Options**: The question provides several options to identify what a heart murmur indicates as defective. The options include:
- A) Bundle of His
- B) Heart valves
- C) Sinoatrial node
- D) Atrioventricular node

3. **Analyzing Each Option**:
- **A) Bundle of His**: This structure is responsible for conducting electrical impulses from the atrioventricular node to the ventricles. It does not directly relate to the sounds produced by blood flow, so this option is incorrect.
- **B) Heart Valves**: Heart murmurs are often caused by blood flowing through abnormal or defective heart valves. This can lead to sounds that are characteristic of murmurs, making this option a strong candidate for the correct answer.
- **C) Sinoatrial Node**: This node is the natural pacemaker of the heart and generates electrical impulses. It does not produce sounds related to blood flow, so this option is also incorrect.
- **D) Atrioventricular Node**: Similar to the sinoatrial node, the AV node is involved in electrical conduction but does not produce sounds associated with blood flow. Therefore, this option is incorrect as well.

4. **Conclusion**: After analyzing all the options, the only structure that directly relates to the production of a heart murmur due to defective conditions is the heart valves. Thus, the correct answer is **B) Heart valves**.

**Final Answer**: A heart murmur indicates a defective **heart valves**.

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