Pacemaker controls

Options :
  1. contraction of pelvis
  2. blood flow in heart
  3. blood flow in arteries
  4. heart beat


Answer and Explanation :-

Answer: Option 4

Explanation:

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You know how the tightrope guy at the circus wants everyone to believe his act is an art, but deep down you can see that he's really just hoping he makes it all the way across?
-Jodi Picoult My Sister's Keeper