Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Identify 
and 
in given diagram & choose the correct option
A
A-Aorta, B-Vena cava, C-Vena cava, D-Sinoatrial node
B
A-Vena cava, B-Aorta, C-Atrio-ventricular node, 
-Sino-atrial node
-Sino-atrial node
C
A-Aorta, B-Vena cava, C- Sino-atrial node, D Atrio-ventricular node
D
A- Sino-atrial node, B-Atrio-ventricular node C-Aorta, D-Vena cava
Text Solution
Verified by ExpertsThe correct answer is:
C
To identify A, B, C, and D in the diagram:
1. **Identify the Structures**:
- **A** refers to the Aorta, the vessel carrying oxygenated blood from the heart.
- **B** is the Vena Cava, responsible for carrying deoxygenated blood to the heart.
- **C** is the Sinoatrial node (SA node), which is the heart's natural pacemaker, located at the top of the right atrium.
- **D** is the Atrio-Ventricular node (AV node), located at the junction of the atria and ventricles.
2. **Analyze Each Option**:
- **Option A** contains two instances of Vena cava, which is incorrect.
- **Option B** incorrectly identifies A as Vena cava.
- **Option C** correctly identifies A as Aorta, B as Vena cava, C as Sino-atrial node, and D as Atrio-ventricular node.
- **Option D** incorrectly identifies A and B.
Therefore, Option C is the correct choice.
1. **Identify the Structures**:
- **A** refers to the Aorta, the vessel carrying oxygenated blood from the heart.
- **B** is the Vena Cava, responsible for carrying deoxygenated blood to the heart.
- **C** is the Sinoatrial node (SA node), which is the heart's natural pacemaker, located at the top of the right atrium.
- **D** is the Atrio-Ventricular node (AV node), located at the junction of the atria and ventricles.
2. **Analyze Each Option**:
- **Option A** contains two instances of Vena cava, which is incorrect.
- **Option B** incorrectly identifies A as Vena cava.
- **Option C** correctly identifies A as Aorta, B as Vena cava, C as Sino-atrial node, and D as Atrio-ventricular node.
- **Option D** incorrectly identifies A and B.
Therefore, Option C is the correct choice.
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