Q139 / 180 · NEET 2019 (Odisha) · Zoology

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 $0.1 \mathrm{sec}$. The delay allows

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

Solution

Atrio-Ventricular Node (AVN) present in the lower corner of the right atrium, delays the spreading of impulses to heart ventricles for about 0.1 second. This pause allows the atria to empty completely into the ventricles before the ventricles pump out the blood.

Hence, the correct answer is option: 'D'.

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