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Q10 Sino-atrial node is called the pacemaker of our heart. Why?
Answers (1)
This is because of the property of originating a cardiac impulse, the sino-atrial node is called the pacemaker of the heart. The sino-atrial node generates the action potential and produces cardiac impulses. This cardiac impulse then spreads over the atria and ventricles causing them to contract or relax. The SA node can generate a maximum number of action potentials which is about 70−75 per minute. It also controls the rhythmic contractile activity of the heart.
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