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easyMCQNEET 20192026BIOLOGY
1 mark

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 . This delay allows:

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

Solution & Step-by-step Explanation

This tissue is the Atrio-Ventricular (AV) node. The AV node delay () is crucial because it ensures that the atria have finished contracting and have completely emptied their blood into the ventricles before the ventricles begin to contract.

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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 . This delay allows:
A
blood to enter aorta.
B
the ventricles to empty completely.
C
blood to enter pulmonary arteries.
D
the atria to empty completely.

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