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

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

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