Antidiuretic hormone's influence on the renal cells causes osmosis of water molecules from the renal fluid to the renal cells and then to the blood stream. This leads to

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Antidiuretic hormone causes water to be reabsorbed from the renal fluid into the bloodstream, increasing blood volume. This is why antidiuretic hormone is sometimes called vasopressin because it can cause vasoconstriction and increase blood pressure as well. It does not directly affect blood osmolarity, urine volume, or activate the thirst center in the hypothalamus. However, the increase in blood volume could potentially lead to a decrease in osmolarity if the added water dilutes the solutes in the blood.

Antidiuretic Hormone's Influence on the Renal Cells Causes Osmosis of Water