Produced when there is less water (high osmotic pressure above normal level of salt concentration) in the blood.
It acts on kidney tubules (nephron) thus increasing water reabsorption from tubules to the blood stream, thus restoring osmotic pressure
When there is more water(lower osmotic pressure) or decreased salt concentration in blood, little or no ADH is produced, less water reabsorbed hence water loss in urine (more dilute urine) hence raising the osmotic pressure in body ?uids/blood
Mohaissack answered the question on October 5, 2017 at 14:47
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