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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Such a simple concept, yet so true. That which we manifest is before us, we are the creators of our own destiny.
-Garth Stein The Art of Racing in the Rain