The best replacement for circulatory is cardiovascular.

The best alternatives to circulatory are rated as following:
★★★★★  cardiovascular
★★★★★  respiratory
★★  lymphatic system
★★  closed circulatory
★★  respiratory system
★  vascular
  respiratory systems
  open circulatory

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Google Trends

Scale is based on the average worldwide traffic of circulatory in all years. Click on graph for more.
circulatory
cardiovascular
respiratory