Systole refers to the contraction of

  • A
    $SA$ node
  • B
    $AV$ node
  • C
    Major arteries
  • D
    Atria and ventricles

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Heart sound '$dup$' is caused due to the closing of:

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If the pacemaker is absent,what will happen?

The $Bundle$ $of$ $His$ are:

Which structure first generates an action potential?

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