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Questions  >>  CBSE XII  >>  Biology
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Q)

The given figure illustrates a section through the human heart. Which labelled part represents the site for the generation of action potential in human heart?


$\begin{array}{1 1} \text{a. A} \\ \text{b. B} \\ \text{c. C} \\ \text{d. D} \end{array}$

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