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Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation2 Marks
Question
Write the features that distinguish between the two, Sino-atrial node and Atrio-ventricular.
✓

Answer

Differences between sinoatrial node and atrio-ventricular node are:
  Sinoatrial node Atrioventricular node
(i) It is present in the right atrium near the opening of superior vena cava. It is also present in the right atrium but near the base of the inter atrial septum.
(ii) It is called pacemaker. It is called pacesetter.
(iii) Impulse of cantraction is intiated and activated by SA node. Impulse initated by SA node is transmitted to all parts of ventricles by AV node.
(iv) It is regulated by the cardiac centres present in the medulla oblongata of the brain. It is stimulated by cardiac impulses originated in the SA node.

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