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Question

Heart beat is initiated by

A
Sinu-auricular node
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B
Atria-ventricular node
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C
Sodium ion
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D
Purkinje's fibres
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Solution

The correct option is A Sinu-auricular node
The sino-atrial node (SAN) is a mass of nodal tissue found in the upper part of right auricle. It generates the nerve impulses which is responsible for starting the contraction of the heart. It controls the rhythm of the heart contraction. Hence, it is called as the natural pacemaker of the heart.

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