Atrio-ventricular node (AVN) is situated-

Options

A. Lower left corner of left auricle, close to AV-septum
B. Lower left corner of right auricle, close to AV-septum
C. Upper left corner of right auricle, close to AV-septum
D. Upper left corner of left auricle, close to AV-septum

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Heart**: The human heart is a four-chambered organ consisting of two atria (upper chambers) and two ventricles (lower chambers). It has a right and left side, with each side containing one atrium and one ventricle.

2. **Identifying the Atrioventricular Node (AVN)**: The Atrioventricular Node (AVN) is a crucial part of the heart's electrical conduction system. It is responsible for transmitting electrical impulses from the atria to the ventricles.

3. **Locating the SA Node**: The Sinoatrial Node (SA Node), which is the primary pacemaker of the heart, is located in the upper right corner of the right atrium.

4. **Finding the AV Node**: The AV Node is situated in the lower left corner of the right atrium (also referred to as the right oracle).

5. **Proximity to the Inter-ventricular Septum**: The AV Node is located near the inter-ventricular septum, which separates the ventricles. This anatomical relationship is important for its function in coordinating the heart's contractions.

6. **Conclusion**: Therefore, the Atrioventricular Node (AVN) is situated in the lower left corner of the right atrium, close to the inter-ventricular septum.

**Final Answer**: The Atrioventricular Node (AVN) is situated in the lower left corner of the right auricle, close to the inter-ventricular septum.

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