Biology · PYQ NEET UG 2019(2)

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. A
   the atria to empty completely.
2. B
   blood to enter aorta.
3. C
   the ventricles to empty completely.
4. D
   blood to enter pulmonary arteries.