NEET 2019 · BiologyPrevious Year Question
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.
Answer: (D) the atria to empty completely.. Answer: (d) the atria to empty completely.
- A.blood to enter aorta.
- B.the ventricles to empty completely.
- C.blood to enter pulmonary arteries.
- D.the atria to empty completely.✓
Correct Answer
(D) the atria to empty completely.
Solution & Explanation
Answer: (d) the atria to empty completely. Solution: The tissue described is the atrio-ventricular node (AVN), located in the lower right atrium near the atrio-ventricular septum. The brief conduction delay it imposes lets the atrial contraction (atrial systole) finish first, so the atria empty their blood completely into the ventricles before the ventricles contract. NCERT: Ch 15, p.199, line 35 — "the atrial systole. This increases the flow of blood into the ventricles"
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