36. The kidneys maintain blood fluid volume through the nephron response to circulating levels of ADH. a. List the direct stimulus for the release of ADH. (2) increased plasma osmolarity b. List the source of ADH. (1) c. List major part of the kidney that responds to ADH. (1) cullecting duct d. List the result of high circulating levels of ADH on (2)= i. blood volume if ii. urine volume..