This program shows the crucial part water plays in the body's functioning and the system for keeping it in balance. Drinking, sweating, and breathing are covered. The urinary tract is analyzed in detail, with particular attention to the functioning of the kidneys.

Water and Salt are Essential for Life (3:25) -- Thirst and Fluid Replacement (5:25) -- Excess Fluids and Urination (3:38) -- Structure and Function of the Kidneys (5:33) -- Path of Urine from Kidneys to Bladder (4:18) -- Eliminating Urine from the Bladder (3:09)