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NEET2019ZoologyBody Fluids and CirculationActual

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 . The delay allows

Options

  1. Ablood to enter aorta
  2. Bthe ventricles to empty completely
  3. Cblood to enter pulmonary arteries
  4. Dthe atria to empty completely

Correct answer

D. the atria to empty completely

Step-by-step 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.

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