Which of the following statements regarding fluid and electrolye balance are true and which are false? A person's greatest daily water loss is most often by way of sweating. Interstitial fluid is the largest water compartment and intracellular fluid is the smallest. Sulfur is needed for some proteins, and phosphorus is needed for DNA and RNA. ANP, secreted by the atria of the heart, increases the excretion of Na+ ions in urine. A drop in blood pressure caused by severe hemorrhage will stimulate the secretion of both ADH and aldosterone. ADH, secreted by the posterior pituitary, increases the absorption of water by the small intestine. By the process of osmosis, and dependent on the electrolytes present, water enters and leaves cells. Metabolic water is constantly produced, but it is the smallest water intake volume.