how does free-water clearance change in the presence of adh
Free water clearance Free water clearance can be used as an indicator of how the body is regulating water. A free water clearance of zero means the kidney is producing urine isosmotic with respect to the plasma. Values greater than zero imply that the kidney is producing dilute urine through the excretion of solute-free water. Values less than zero imply that the kidney is conserving water (likely under the influence of antidiuretic hormone, ADH), resulting in the production of concentrated urine.
Living Water In Jeremiah 2:13 and 17:13, the prophet describes God as "the spring of living water", who has been forsaken by his chosen people Israel. Later, the prophet Zechariah described Jerusalem as a source of "living water", "half [flowing] east to the Dead Sea and half of it west to the Mediterranean Sea, in summer and in winter" (Zechariah 14:8). The Pulpit Commentary notes that the city of Jerusalem "was, as we know, abundantly supplied with water by many conduits and subterranean channels; but standing, as it does, surrounded by hills higher than itself, it is physically impossible that the waters could literally flow as stated. The description is symbolical…"[1]