What does it take to stay alive? On this ID the Future, host Eric Anderson concludes his conversation with physician Howard Glicksman about the remarkable systems in the human body that help control water and sodium to keep us alive. In Part 2, Dr. Glicksman discusses two more innovations that add a "push-pull" effect to the systems discussed in Part 1. First, a sensor in the heart kicks into action when water or sodium levels get too high. Second, an anti-diuretic system in the hypothalamus that detects cell shrinkage and promotes water retention. In true engineering fashion, these systems are interdependent and tightly integrated, working together in unison (along with your own active participation!) to safeguard your body and help you live your best life. This is Part 2 of a two-part conversation.

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