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A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrioventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. This delay allows

1. the atria to empty completely.
2. blood to enter aorta.
3. the ventricles to empty completely.
4. blood to enter pulmonary arteries.

Correct answer: the atria to empty completely.

Solution

The nodal tissue described is the AV node, which slows conduction briefly. This pause lets atrial contraction complete so the ventricles receive their full blood volume before they contract.

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