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Biology · PYQ NEET UG 2019(2)

हिन्दी

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.

Correct answer · Option 1

the atria to empty completely.

Explanation

The delay at the AV node allows the atria to empty their blood completely into the ventricles before the ventricles contract.
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