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  4. The given figure illustrates a section through the human heart. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/fe1a1f5b04f8cfcb4d9136ac2e5b5dfd-.png /> Which labelled part represents the site for the generation of action potential in human heart?

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

Body Fluids and Circulation

Solution:

$'A'$ is $SA$ node that is the site for generation of action potential in human heart.