What is the main reason for opening and closing the heart valves, pressure or electrical activity? – Secondary 11

Question: What is the main reason for opening and closing the heart valves, pressure or electrical activity?
- Keywords:
  electricity,
  heart,
  heart rate,
  pressure,
  valve
Asked by spacenut to David, Mus, Tess, Yue on 15 May 2012.
- Tess Newman answered on 15 May 2012:
  
  Electrical stimulation of your heat by the brain makes the heart ‘beat’ – that it, it contracts. This creates the pressure force that pushes the blood into the next chamber, or around the body. So the pressure of the blood opens the valves (which only work one way), and this pressure is created by the electric stimulation of the heart

spacenut commented on 15 May 2012:

Oh so mainly electrical stimulation?? Is that stimulated by nerves directly from the
Spinal cord then?

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Question: What is the main reason for opening and closing the heart valves, pressure or electrical activity?