Dear All, According to practical experience & variations & recent international guidelines which organ/system in human body should be targeted to save a human life? Which Organ/ system is most important / need care at FIRST to save or continuation of human life: The Heart/Circulatory system(cardiovascular system) The Lungs/ Respiratory System.

The Brain/ Nervous system  The Endocrine system  The  gastrointestinal or urologic system or musculoskeletal system   " Cardia   is  only   one Pump  in human  body  "