Purkinje fibres are present in

  • A

    Brain

  • B

    Heart

  • C

    Blood

  • D

    Lungs

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Spiral valve is present in

The heart of a healthy man beats normally per minute

Describe internal structure of heart in detail. 

Definition / Explanation :

$(1)$ Semi lunar valve 

The opening of auricles and ventricles on the right side is guarded by