Answer
If a person drank a liter of water and it was absorbed into his small intestine, the osmotic pressure of the blood would decrease. Low blood osmotic pressure, or increased blood volume would inhibit the activity of hypothalamic osmoreceptors; the result would be that ADH secretion would decline or stop completely, temporarily.
Work Step by Step
The decrease in the availability of ADH in the blood would permit the kidneys to secrete more urine; also, arterioles would dilate, and sweat glands would become more active. Slowly, blood volume and osmotic pressure of the body's extracellular fluids would return to normal values.
