Human filters 200L per day, have to recover the water. Counter current multiplier effect of loop of Henle. Water and salt, sugar, aas out of prox tubule. Impermeability of water thru ascending tubule so water can t follow salt out, sets up counter current. Lose more water in distal tubule once membrane becomes permeable again, due to high salt in loop.
Excess angiotensin causes hypertension.
ADH and angiotensin feed back to juxtaglomerular apparatus to inhibit renin. Increased water in blood inhibits ADH and urine becomes more dilute.