Question:
A small pore present in the inter-Atrial septum of the fetal heart is
A small pore present in the inter-Atrial septum of the fetal heart is
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The foramen ovale allows right-to-left atrial shunting in the fetal heart. It closes at birth forming the fossa ovalis.
Updated On: Jun 19, 2026
- Fossa ovalis
- S A node
- Foramen ovale
- AV node
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The Correct Option is C
Solution and Explanation
Step 1: Fetal circulation overview.
In the fetal heart, oxygenated blood comes from the placenta and must bypass the lungs which are non-functional before birth.
Step 2: Role of inter-atrial connection.
The foramen ovale is an opening in the interatrial septum allowing blood to flow directly from right atrium to left atrium, bypassing the pulmonary circulation.
Step 3: Fossa ovalis after birth.
After birth, the lungs inflate and pressure changes cause the foramen ovale to close. The remnant is called the fossa ovalis.
Step 4: Eliminate other options.
- SA node: Pacemaker of the heart, not a pore.
- AV node: Part of conduction system, not a pore.
Step 5: Conclusion.
The small pore in the fetal inter-atrial septum is Foramen ovale.
In the fetal heart, oxygenated blood comes from the placenta and must bypass the lungs which are non-functional before birth.
Step 2: Role of inter-atrial connection.
The foramen ovale is an opening in the interatrial septum allowing blood to flow directly from right atrium to left atrium, bypassing the pulmonary circulation.
Step 3: Fossa ovalis after birth.
After birth, the lungs inflate and pressure changes cause the foramen ovale to close. The remnant is called the fossa ovalis.
Step 4: Eliminate other options.
- SA node: Pacemaker of the heart, not a pore.
- AV node: Part of conduction system, not a pore.
Step 5: Conclusion.
The small pore in the fetal inter-atrial septum is Foramen ovale.
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