Osmoregulation, blood volume and blood pressure

• Osmoregulation, blood volume and blood pressure are closely interconnected
• In response to high osmolarity or low blood volume, ADH increase water retention, elevating blood volume and pressure
• Blood volume: increased water reabsorption raises blood volume. Decreased water reabsorption lowers blood volume
• Blood pressure: higher blood volume increases blood pressure by adding pressure to vessel walls. Lower blood volume decreases blood pressure by lowering pressure in vessel walls 
• High blood pressure inhibits ADH, reducing water retention
• Low blood volume stimulates ADH, increasing water conservation