Two curved arrows form a loop. On the left side of the loop, the text reads ‘LESS ADH - No thirst’. On the right side of the text reads ‘MORE ADH - Thirst sensation’. In the middle, the text reads ‘Hypothalamus senses low or high concentration of water in blood and signals pituitary’. On the top, the text reads, Sweating, reduced water intake, and urination reduce blood volume’. At the bottom, the text reads, ‘Drinking (response to thirst) and decreased kidney action increase blood volume’.