Pacemaker controls

Options :
  1. contraction of pelvis
  2. blood flow in heart
  3. blood flow in arteries
  4. heartbeat
Answer and Explanation :-

Answer: Option 4

Explanation:

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You should always listen to minotaurs. Anybody with four stomachs has to have a firm grip on reality.
-Catherynne M. Valente The Girl Who Soared Over Fairyland and Cut the Moon in Two