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Home » A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular 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.
A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular 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.
biology
A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular 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.

The correct answer is (1) the atria to empty completely.

This is because – The AVN-provided delay in impulse transmission from SAN to the ventricles prevents simultaneous contraction of the ventricles and auricles. This allows the atria to completely empty before the ventricles begin to contract.

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