12-08-2007, 04:55 PM
IT IS ALSO ELEVATED IN WEIGHTLESSNESS!1
IT IS A HORMONE SECRETED BY THE HEART ESPECIALLY THE RIGHT ATRIUM IN RESPONSE TO STRETCH OF THE ATRIA AND INCREASED SODIUM INTAKE.
ITS EFFECTS ANTAGONISE BOTH ANGIOTENSIN II AND ADH.
BECAUSE IT INCREASES NA AND H2O EXCRETION BY THE KIDNEY.
IT INCREASES GFR BY DILATING AFFERENT AND CONSTRICTING EFFERENT. IT BLOCKS SODIUM REABSORPTION IN THE COLLECTING DUCTS AS WELL AS WATER REABSORPTION. THEREFORE IT RESULTS IN NATRIURESIS AND DIURESIS.
IT IS A HORMONE SECRETED BY THE HEART ESPECIALLY THE RIGHT ATRIUM IN RESPONSE TO STRETCH OF THE ATRIA AND INCREASED SODIUM INTAKE.
ITS EFFECTS ANTAGONISE BOTH ANGIOTENSIN II AND ADH.
BECAUSE IT INCREASES NA AND H2O EXCRETION BY THE KIDNEY.
IT INCREASES GFR BY DILATING AFFERENT AND CONSTRICTING EFFERENT. IT BLOCKS SODIUM REABSORPTION IN THE COLLECTING DUCTS AS WELL AS WATER REABSORPTION. THEREFORE IT RESULTS IN NATRIURESIS AND DIURESIS.