A human kidney filters about 200 liters of blood each day. Approximately two liters of liquid and nutrient waste are excreted as urine. The remaining fluid and dissolved substances are reabsorbed and continue to circulate throughout the body. Antidiuretic hormone (ADH) is secreted in response to reduced plasma volume. ADH targets the collecting ducts in the kidney, stimulating the insertion of aquaporins into their plasma membranes and an increased reabsorption of water.If ADH secretion is inhibited, which of the following would initially result?
a) Number of aquaporins would increase in response to the inhibition of ADH
b) The person would decrease oral water intake to compensate for the inhibition of ADH
c) Blood filtration would increase to compensate for lack of aquaporins
d) Person would produce a greater amount of dilute urine

ADH stands for anti diuretic hormone. It is also called vasopressin or arginine vasopressin. It is a hormone produced by the hypothalamus of the brain and then stored in the posterior pituitary gland.

Anti diuretic hormone acts by regulating the water balance in the blood. Osmotic sensors in the hypothalamus react to the concentration of particles in the blood. These particles include molecules of sodium, potassium, chloride, etc.

When blood pressure is too low, these sensors and baroreceptors tell your kidneys to release water to maintain a healthy range of these substances. They also regulate the body’s sense of thirst.