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B
Auricles
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C
Striated muscle fibre
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D
Throughout the heart
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Solution
The correct option is D Ventricles The Purkinje fibres are located in the inner ventricular walls of the heart, just beneath the endocardium in a space, called as the subendocardium. These fibres consist of specialized cardiomyocytes, that are able to conduct cardiac action potentials.