Let us consider how the balance of body fluids fluctuates after a marathon and how it is regulated back to recovery. Immediately after a marathon, because water is lost through respiration and both water and ions are lost through sweat, the osmotic pressure in blood plasma is elevated and there is a loss in blood volume.
These changes are sensed by osmotic pressure receptors in the hypothalamus which incite thirst (for the act of drinking water). At the same time, vasopressin (hormona antidiurética) is secreted, and urination is almost completely stopped because water is reabsorbed by the kidneys.
These changes are sensed by osmotic pressure receptors in the hypothalamus which incite thirst (for the act of drinking water). At the same time, vasopressin (hormona antidiurética) is secreted, and urination is almost completely stopped because water is reabsorbed by the kidneys.
