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Respiration and Circulation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYRespiration and Circulation1 Mark
Question
Mention the role of pacemaker in human heart.
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Answer

1. The Sinu-auricular (SA) node is the pacemaker of the heart.
2. It generates wave of contraction which spread along the wall of atria and bring about their contraction.
3. It has highest degree of rhythmicity and is the first to originate the cardiac impulses and determine the rate of heart beat.

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