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SA node is located in...

SA node is located in

A

upper lateral wall of left atrium

B

lower lateral wall of left atrium

C

lower lateral wall of right ventricle

D

upper part of wall of right atrium

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the location of the SA node, which is an important structure in the heart responsible for initiating the heartbeat. 2. **Identifying the Options**: The options provided are: - A) Upper lateral wall of left atrium - B) Lower lateral wall of left atrium - C) Lower lateral wall of right ventricle - D) Upper part of wall of right atrium 3. **Analyzing Each Option**: - **Option A**: Upper lateral wall of left atrium - This is incorrect as the SA node is not located in the left atrium. - **Option B**: Lower lateral wall of left atrium - This is also incorrect for the same reason as above. - **Option C**: Lower lateral wall of right ventricle - This is incorrect as the SA node is not in the right ventricle. - **Option D**: Upper part of wall of right atrium - This is the correct option. 4. **Locating the SA Node**: The SA node, also known as the sinoatrial node, is located at the junction of the superior vena cava and the upper wall of the right atrium. It is often referred to as the pacemaker of the heart because it generates electrical impulses that initiate the heartbeat. 5. **Conclusion**: Based on the analysis, the correct answer is option D: Upper part of wall of right atrium. **Final Answer**: The SA node is located in the upper part of the wall of the right atrium (Option D). ---
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