Are you asking if pulsation flow is needed? Other systems depend on the pulsation nature of our circulatory system. I'm no expert, but off the top of my head CSF flow and bowel peristalsis depend on pulsation blood flow to a degree (or so I was taught, ages ago). I'm sure there are others who are more knowledgeable here though.

When it come to nature, overall power usage is hard to beat. We run a full day with a few meals. That is quite a feat.